The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0743 advisory.

    The Advanced Virtualization module provides the user-space component for running virtual machines that use     KVM in environments managed by Red Hat products.

    Security Fix(es):

    * QEMU: virtiofsd: potential privileged host device access from guest (CVE-2020-35517)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system     daemon where a privileged guest user is able to create a device special file in the shared directory and     use it to r/w access host devices. (CVE-2020-35517)

Note that Nessus relies on the presence of the package as reported by the vendor.

The Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-2021_0711 advisory.

    * QEMU: virtiofsd: potential privileged host device access from guest (CVE-2020-35517)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5010-1 advisory.

    Lei Sun discovered that QEMU incorrectly handled certain MMIO operations. An attacker inside the guest     could possibly use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2020-15469)

    Wenxiang Qian discovered that QEMU incorrectly handled certain ATAPI commands. An attacker inside the     guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue     only affected Ubuntu 21.04. (CVE-2020-29443)

    Cheolwoo Myung discovered that QEMU incorrectly handled SCSI device emulation. An attacker inside the     guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service.
    (CVE-2020-35504, CVE-2020-35505, CVE-2021-3392)

    Alex Xu discovered that QEMU incorrectly handled the virtio-fs shared file system daemon. An attacker     inside the guest could possibly use this issue to read and write to host devices. This issue only affected     Ubuntu 20.10. (CVE-2020-35517)

    It was discovered that QEMU incorrectly handled ARM Generic Interrupt Controller emulation. An attacker     inside the guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service.
    This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2021-20221)

    Alexander Bulekov, Cheolwoo Myung, Sergej Schumilo, Cornelius Aschermann, and Simon Werner discovered that     QEMU incorrectly handled e1000 device emulation. An attacker inside the guest could possibly use this     issue to cause QEMU to hang, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS,     Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2021-20257)

    It was discovered that QEMU incorrectly handled SDHCI controller emulation. An attacker inside the guest     could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute     arbitrary code. In the default installation, when QEMU is used in combination with libvirt, attackers     would be isolated by the libvirt AppArmor profile. (CVE-2021-3409)

    It was discovered that QEMU incorrectly handled certain NIC emulation devices. An attacker inside the     guest could possibly use this issue to cause QEMU to hang or crash, resulting in a denial of service. This     issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2021-3416)

    Remy Noel discovered that QEMU incorrectly handled the USB redirector device. An attacker inside the guest     could possibly use this issue to cause QEMU to consume resources, resulting in a denial of service.
    (CVE-2021-3527)

    It was discovered that QEMU incorrectly handled the virtio vhost-user GPU device. An attacker inside the     guest could possibly use this issue to cause QEMU to consume resources, leading to a denial of service.
    This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-3544)

    It was discovered that QEMU incorrectly handled the virtio vhost-user GPU device. An attacker inside the     guest could possibly use this issue to obtain sensitive host information. This issue only affected Ubuntu     20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-3545)

    It was discovered that QEMU incorrectly handled the virtio vhost-user GPU device. An attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute     arbitrary code. In the default installation, when QEMU is used in combination with libvirt, attackers     would be isolated by the libvirt AppArmor profile. This issue only affected Ubuntu 20.04 LTS, Ubuntu     20.10, and Ubuntu 21.04. (CVE-2021-3546)

    It was discovered that QEMU incorrectly handled the PVRDMA device. An attacker inside the guest could use     this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code.
    In the default installation, when QEMU is used in combination with libvirt, attackers would be isolated by     the libvirt AppArmor profile. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04.
    (CVE-2021-3582, CVE-2021-3607, CVE-2021-3608)

    It was discovered that QEMU SLiRP networking incorrectly handled certain udp packets. An attacker inside a     guest could possibly use this issue to leak sensitive information from the host. (CVE-2021-3592,     CVE-2021-3593, CVE-2021-3594, CVE-2021-3595)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0711 advisory.

    Kernel-based Virtual Machine (KVM) offers a full virtualization solution for Linux on numerous hardware     platforms. The virt:rhel module contains packages which provide user-space components used to run virtual     machines using KVM. The packages also provide APIs for managing and interacting with the virtualized     systems.

    Security Fix(es):

    * QEMU: virtiofsd: potential privileged host device access from guest (CVE-2020-35517)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0489 advisory.

    This advisory aggregates security fixes for the qemu-kvm SRPM in CIQ LTS 9.2. It addresses 31 CVEs:
    CVE-2020-14364, CVE-2019-11091, CVE-2021-20221, CVE-2024-3446, CVE-2018-12130, and 26 more.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_1484 advisory.

    This advisory aggregates security fixes for the qemu-kvm SRPM in CIQ LTS 9.6. It addresses 41 CVEs:
    CVE-2020-14364, CVE-2019-11091, CVE-2021-20221, CVE-2018-12130, CVE-2020-1983, and 36 more.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2021-1567:01 advisory.

    * QEMU: virtiofsd: potential privileged host device access from guest     (CVE-2020-35517)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0252 advisory.

    This advisory aggregates security fixes for the qemu-kvm SRPM in CIQ LTS 8.6. It addresses 49 CVEs:
    CVE-2020-14364, CVE-2019-11091, CVE-2021-20221, CVE-2024-3446, CVE-2018-12130, and 44 more.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2021:0711 advisory.

  - QEMU: virtiofsd: potential privileged host device access from guest (CVE-2020-35517)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-202208-27 (QEMU: Multiple Vulnerabilities)

  - QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c because a guest OS user can trigger an e1000e     packet with the data's address set to the e1000e's MMIO address. (CVE-2020-15859)

  - hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This     occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or     process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or     potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.
    (CVE-2020-15863)

  - In QEMU through 5.0.0, an assertion failure can occur in the network packet processing. This issue affects     the e1000e and vmxnet3 network devices. A malicious guest user/process could use this flaw to abort the     QEMU process on the host, resulting in a denial of service condition in net_tx_pkt_add_raw_fragment in     hw/net/net_tx_pkt.c. (CVE-2020-16092)

  - A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0.
    This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of     service. The highest threat from this vulnerability is to system availability. (CVE-2020-35504)

  - A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw     allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.
    The highest threat from this vulnerability is to system availability. (CVE-2020-35505)

  - A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows     a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or     potential code execution with the privileges of the QEMU process. (CVE-2020-35506)

  - A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system     daemon where a privileged guest user is able to create a device special file in the shared directory and     use it to r/w access host devices. (CVE-2020-35517)

  - An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It     may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A     privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.
    (CVE-2021-20203)

  - An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing     transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid     values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The     highest threat from this vulnerability is to system availability. (CVE-2021-20257)

  - A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option     may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a     modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a     malicious user to elevate their privileges within the guest. (CVE-2021-20263)

  - The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to     the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This     flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of     service or potential code execution. QEMU up to (including) 5.2.0 is affected by this. (CVE-2021-3409)

  - A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions     up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get     bypassed. A guest user/process may use this flaw to consume CPU cycles or crash the QEMU process on the     host resulting in DoS scenario. (CVE-2021-3416)

  - A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a     single, large transfer request, to reduce the overhead and improve performance. The combined size of the     bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper     validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the     array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a     denial of service. (CVE-2021-3527)

  - Several memory leaks were found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions     up to and including 6.0. They exist in contrib/vhost-user-gpu/vhost-user-gpu.c and contrib/vhost-user-     gpu/virgl.c due to improper release of memory (i.e., free) after effective lifetime. (CVE-2021-3544)

  - An information disclosure vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of     QEMU in versions up to and including 6.0. The flaw exists in virgl_cmd_get_capset_info() in contrib/vhost-     user-gpu/virgl.c and could occur due to the read of uninitialized memory. A malicious guest could exploit     this issue to leak memory from the host. (CVE-2021-3545)

  - An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of     QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET'     command from the guest. It could allow a privileged guest user to crash the QEMU process on the host,     resulting in a denial of service condition, or potential code execution with the privileges of the QEMU     process. (CVE-2021-3546)

  - A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. The issue occurs while     handling a PVRDMA_CMD_CREATE_MR command due to improper memory remapping (mremap). This flaw allows a     malicious guest to crash the QEMU process on the host. The highest threat from this vulnerability is to     system availability. (CVE-2021-3582)

  - An integer overflow was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions     prior to 6.1.0. The issue occurs while handling a PVRDMA_REG_DSRHIGH write from the guest due to     improper input validation. This flaw allows a privileged guest user to make QEMU allocate a large amount     of memory, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2021-3607)

  - A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to     6.1.0. The issue occurs while handling a PVRDMA_REG_DSRHIGH write from the guest and may result in a     crash of QEMU or cause undefined behavior due to the access of an uninitialized pointer. The highest     threat from this vulnerability is to system availability. (CVE-2021-3608)

  - A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious     guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service     condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU     versions prior to 7.0.0. (CVE-2021-3611)

  - A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs     when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A     malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata,     resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the     host. (CVE-2021-3682)

  - An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions     prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-     bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this     flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the     host. (CVE-2021-3713)

  - A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the     descriptor's address belongs to the non direct access region, due to num_buffers being set after the     virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a     denial of service condition, or potentially execute code on the host with the privileges of the QEMU     process. (CVE-2021-3748)

  - A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the     Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be     written to the controller's registers and trigger undesirable actions (such as reset) while the device is     still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could     use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or     potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects     QEMU versions before 7.0.0. (CVE-2021-3750)

  - An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE     SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious     guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
    (CVE-2021-3930)

  - A stack-buffer-overflow was found in QEMU in the NVME component. The flaw lies in nvme_changed_nslist()     where a malicious guest controlling certain input can read out of bounds memory. A malicious user could     use this flaw leading to disclosure of sensitive information. (CVE-2021-3947)

  - A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0.
    The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A     malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host     when writing data reaches the threshold of mirroring node. (CVE-2021-4145)

  - A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc()     function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer     overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or     potentially execute arbitrary code within the context of the QEMU process. (CVE-2021-4206)

  - A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values     `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object     followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw     to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU     process. (CVE-2021-4207)

  - A flaw was found in the virtio-net device of QEMU. This flaw was inadvertently introduced with the fix for     CVE-2021-3748, which forgot to unmap the cached virtqueue elements on error, leading to memory leakage and     other unexpected results. Affected QEMU version: 6.2.0. (CVE-2022-26353)

  - A flaw was found in the vhost-vsock device of QEMU. In case of error, an invalid element was not detached     from the virtqueue before freeing its memory, leading to memory leakage and other unexpected results.
    Affected QEMU versions <= 6.2.0. (CVE-2022-26354)

  -  Please review the referenced CVE identifiers for details.  (CVE-2021-3929)

  - QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c (CVE-2021-4158)

  - QEMU: virtiofsd: potential privilege escalation via CVE-2018-13405 (CVE-2022-0358)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2021:0027 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2020-35517:
    A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system     daemon where a privileged guest user is able to create a device special file in the shared directory and     use it to r/w access host devices.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:0711 advisory.

  - A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system     daemon where a privileged guest user is able to create a device special file in the shared directory and     use it to r/w access host devices. (CVE-2020-35517)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	名稱	產品	系列	已發布	已更新	嚴重性
147196	RHEL 8 : virt:8.2 and virt-devel:8.2 (RHSA-2021:0743)	Nessus	Red Hat Local Security Checks	2021/3/8	2024/11/7	high
223458	Linux Distros Unpatched Vulnerability : CVE-2020-35517	Nessus	Misc.	2025/3/4	2026/7/27	high
358052	Rocky Linux 8 [CIQ] Security Update: hivex / hivex-debuginfo / hivex-debugsource / hivex-devel / etc (crlsa-2021_0711)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	high
151680	Ubuntu 18.04 LTS / 20.04 LTS : QEMU vulnerabilities (USN-5010-1)	Nessus	Ubuntu Local Security Checks	2021/7/16	2025/9/3	high
147012	RHEL 8 : virt:rhel and virt-devel:rhel (RHSA-2021:0711)	Nessus	Red Hat Local Security Checks	2021/3/3	2024/11/7	high
356949	Rocky Linux 9.2 [CIQ] Security Update: qemu-guest-agent / qemu-guest-agent-debuginfo / qemu-img / etc Multiple Vulnerabilities (ciqsa-2026_0489)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/13	critical
354457	Rocky Linux 9.6 [CIQ] Security Update: qemu-guest-agent / qemu-guest-agent-debuginfo / qemu-img / etc Multiple Vulnerabilities (ciqsa-2026_1484)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/13	critical
294005	MiracleLinux 8 : virt:rhel (AXSA:2021-1567:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
355166	Rocky Linux 8.6 [CIQ] Security Update: qemu-guest-agent / qemu-guest-agent-debuginfo / qemu-img / etc Multiple Vulnerabilities (ciqsa-2026_0252)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/12	critical
146994	CentOS 8 : virt:rhel and virt-devel:rhel (CESA-2021:0711)	Nessus	CentOS Local Security Checks	2021/3/3	2024/1/18	high
164115	GLSA-202208-27 : QEMU: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	2022/8/15	2023/10/16	high
236668	Alibaba Cloud Linux 3 : 0027: virt:rhel and virt-devel:rhel (ALINUX3-SA-2021:0027)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high
185039	Rocky Linux 8 : virt:rhel and virt-devel:rhel (RLSA-2021:0711)	Nessus	Rocky Linux Local Security Checks	2023/11/7	2023/11/7	high

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