A flaw was discovered in the Linux kernel's KVM (kernel virtual machine). An administrative user in the guest OS could leverage this flaw to cause a denial of service in the host OS. (CVE-2012-2121)

Multiple integer overflow flaws where discovered in the Alchemy LCD frame- buffer drivers in the Linux kernel. An unprivileged local user could exploit this flaw to gain administrative privileges.
(CVE-2013-4511).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Andy Adamson discovered a flaw in the Linux kernel's NFSv4 implementation. A remote NFS server (attacker) could exploit this flaw to cause a denial of service. (CVE-2011-4131)

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual cpu setup. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. (CVE-2012-1601)

A flaw was discovered in the Linux kernel's KVM (kernel virtual machine). An administrative user in the guest OS could leverage this flaw to cause a denial of service in the host OS. (CVE-2012-2121)

Steve Grubb reported a flaw with Linux fscaps (file system base capabilities) when used to increase the permissions of a process. For application on which fscaps are in use a local attacker can disable address space randomization to make attacking the process with raised privileges easier. (CVE-2012-2123)

Schacher Raindel discovered a flaw in the Linux kernel's memory handling when hugetlb is enabled. An unprivileged local attacker could exploit this flaw to cause a denial of service and potentially gain higher privileges. (CVE-2012-2133).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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

  - The KVM implementation in the Linux kernel before 3.3.4 does not properly manage the relationships between     memory slots and the iommu, which allows guest OS users to cause a denial of service (memory leak and host     OS crash) by leveraging administrative access to the guest OS to conduct hotunplug and hotplug operations     on devices. (CVE-2012-2121)

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

The remote MiracleLinux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2014-242:01 advisory.

    KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware.
    Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual     machine has private virtualized hardware: a network card, disk, graphics adapter, etc.
    Security issues fixed with this release:
     CVE-2013-6367     The apic_get_tmcct function in arch/x86/kvm/lapic.c in the KVM subsystem in the Linux kernel through     3.12.5 allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via     crafted modifications of the TMICT value.
     CVE-2013-6368     The KVM subsystem in the Linux kernel through 3.12.5 allows local users to gain privileges or cause a     denial of service (system crash) via a VAPIC synchronization operation involving a page-end address.
     CVE-2012-1601     The KVM implementation in the Linux kernel before 3.3.6 allows host OS users to cause a denial of service     (NULL pointer dereference and host OS crash) by making a KVM_CREATE_IRQCHIP ioctl call after a virtual CPU     already exists.
     CVE-2012-2121     The KVM implementation in the Linux kernel before 3.3.4 does not properly manage the relationships between     memory slots and the iommu, which allows guest OS users to cause a denial of service (host OS crash) by     leveraging administrative access to the guest OS to conduct hotunplug and hotplug operations on devices.
     CVE-2012-3515     Qemu, as used in Xen 4.0, 4.1 and possibly other products, when emulating certain devices with a virtual     console backend, allows local OS guest users to gain privileges via a crafted escape VT100 sequence that     triggers the overwrite of a device model's address space.
     CVE-2013-1796     The kvm_set_msr_common function in arch/x86/kvm/x86.c in the Linux kernel through 3.8.4 does not ensure a     required time_page alignment during an MSR_KVM_SYSTEM_TIME operation, which allows guest OS users to cause     a denial of service (buffer overflow and host OS memory corruption) or possibly have unspecified other     impact via a crafted application.
     CVE-2013-1797     Use-after-free vulnerability in arch/x86/kvm/x86.c in the Linux kernel through 3.8.4 allows guest OS users     to cause a denial of service (host OS memory corruption) or possibly have unspecified other impact via a     crafted application that triggers use of a guest physical address (GPA) in (1) movable or (2) removable     memory during an MSR_KVM_SYSTEM_TIME kvm_set_msr_common operation.
     CVE-2013-1798     The ioapic_read_indirect function in virt/kvm/ioapic.c in the Linux kernel through 3.8.4 does not properly     handle a certain combination of invalid IOAPIC_REG_SELECT and IOAPIC_REG_WINDOW operations, which allows     guest OS users to obtain sensitive information from host OS memory or cause a denial of service (host OS     OOPS) via a crafted application.
    Fixed bug:
     Fixed a very rare off-by-one error in the QEMU guest's memory management.

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

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

Updated kvm packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel.

A flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled.
Calling this ioctl when at least one virtual CPU (VCPU) already existed could lead to a NULL pointer dereference later when the VCPU is scheduled to run. A malicious user in the kvm group on the host could use this flaw to crash the host. (CVE-2012-1601)

A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user in the kvm group on the host who has the ability to assign a device to a guest could use this flaw to crash the host.
(CVE-2012-2121)

This update also fixes the following bug :

* An off-by-one error in the QEMU guest's memory management could, in rare cases, cause QEMU-KVM to crash due to a segmentation fault in tb_invalidate_phys_page_range() if a device initiated DMA into a specific guest address. In a reported case, this issue presented on a system that had a guest using the 8139cp network driver. (BZ#816207)

All users of kvm are advised to upgrade to these updated packages, which contain backported patches to correct these issues. Note that the procedure in the Solution section must be performed before this update will take effect.

A flaw was discovered in the Linux kernel's KVM (kernel virtual machine). An administrative user in the guest OS could leverage this flaw to cause a denial of service in the host OS. (CVE-2012-2121)

Schacher Raindel discovered a flaw in the Linux kernel's memory handling when hugetlb is enabled. An unprivileged local attacker could exploit this flaw to cause a denial of service and potentially gain higher privileges. (CVE-2012-2133)

Stephan Mueller reported a flaw in the Linux kernel's dl2k network driver's handling of ioctls. An unprivileged local user could leverage this flaw to cause a denial of service. (CVE-2012-2313)

Timo Warns reported multiple flaws in the Linux kernel's hfsplus filesystem. An unprivileged local user could exploit these flaws to gain root system priviliges. (CVE-2012-2319)

Xi Wang discovered a flaw in the Linux kernel's i915 graphics driver handling of cliprect on 32 bit systems. An unprivileged local attacker could leverage this flaw to cause a denial of service or potentially gain root privileges. (CVE-2012-2383)

Xi Wang discovered a flaw in the Linux kernel's i915 graphics driver handling of buffer_count on 32 bit systems. An unprivileged local attacker could leverage this flaw to cause a denial of service or potentially gain root privileges. (CVE-2012-2384)

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Scientific Linux kernel.

A flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled.
Calling this ioctl when at least one virtual CPU (VCPU) already existed could lead to a NULL pointer dereference later when the VCPU is scheduled to run. A malicious user in the kvm group on the host could use this flaw to crash the host. (CVE-2012-1601)

A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user in the kvm group on the host who has the ability to assign a device to a guest could use this flaw to crash the host.
(CVE-2012-2121)

This update also fixes the following bug :

  - An off-by-one error in the QEMU guest's memory     management could, in rare cases, cause QEMU-KVM to crash     due to a segmentation fault in     tb_invalidate_phys_page_range() if a device initiated     DMA into a specific guest address. In a reported case,     this issue presented on a system that had a guest using     the 8139cp network driver.

All users of kvm are advised to upgrade to these updated packages, which contain backported patches to correct these issues. Note that the procedure in the Solution section must be performed before this update will take effect.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, information leak or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2012-2121     Benjamin Herrenschmidt and Jason Baron discovered issues     with the IOMMU mapping of memory slots used in KVM     device assignment. Local users with the ability to     assign devices could cause a denial of service due to a     memory page leak.

  - CVE-2012-3552     Hafid Lin reported an issue in the IP networking     subsystem. A remote user can cause a denial of service     (system crash) on servers running applications that set     options on sockets which are actively being processed.

  - CVE-2012-4461     Jon Howell reported a denial of service issue in the KVM     subsystem. On systems that do not support the XSAVE     feature, local users with access to the /dev/kvm     interface can cause a system crash.

  - CVE-2012-4508     Dmitry Monakhov and Theodore Ts'o reported a race     condition in the ext4 filesystem. Local users could gain     access to sensitive kernel memory.

  - CVE-2012-6537     Mathias Krause discovered information leak issues in the     Transformation user configuration interface. Local users     with the CAP_NET_ADMIN capability can gain access to     sensitive kernel memory.

  - CVE-2012-6539     Mathias Krause discovered an issue in the networking     subsystem. Local users on 64-bit systems can gain access     to sensitive kernel memory.

  - CVE-2012-6540     Mathias Krause discovered an issue in the Linux virtual     server subsystem. Local users can gain access to     sensitive kernel memory. Note: this issue does not     affect Debian provided kernels, but may affect custom     kernels built from Debian's linux-source-2.6.32 package.

  - CVE-2012-6542     Mathias Krause discovered an issue in the LLC protocol     support code. Local users can gain access to sensitive     kernel memory.

  - CVE-2012-6544     Mathias Krause discovered issues in the Bluetooth     subsystem. Local users can gain access to sensitive     kernel memory.

  - CVE-2012-6545     Mathias Krause discovered issues in the Bluetooth RFCOMM     protocol support. Local users can gain access to     sensitive kernel memory.

  - CVE-2012-6546     Mathias Krause discovered issues in the ATM networking     support. Local users can gain access to sensitive kernel     memory.

  - CVE-2012-6548     Mathias Krause discovered an issue in the UDF file     system support. Local users can obtain access to     sensitive kernel memory.

  - CVE-2012-6549     Mathias Krause discovered an issue in the isofs file     system support. Local users can obtain access to     sensitive kernel memory.

  - CVE-2013-0349     Anderson Lizardo discovered an issue in the Bluetooth     Human Interface Device Protocol (HIDP) stack. Local     users can obtain access to sensitive kernel memory.

  - CVE-2013-0914     Emese Revfy discovered an issue in the signal     implementation. Local users may be able to bypass the     address space layout randomization (ASLR) facility due     to a leaking of information to child processes.

  - CVE-2013-1767     Greg Thelen reported an issue in the tmpfs virtual     memory filesystem. Local users with sufficient privilege     to mount filesystems can cause a denial of service or     possibly elevated privileges due to a use-after free     defect.

  - CVE-2013-1773     Alan Stern provided a fix for a defect in the     UTF8->UTF16 string conversion facility used by the VFAT     filesystem. A local user could cause a buffer overflow     condition, resulting in a denial of service or     potentially elevated privileges.

  - CVE-2013-1774     Wolfgang Frisch provided a fix for a NULL pointer     dereference defect in the driver for some serial USB     devices from Inside Out Networks. Local users with     permission to access these devices can create a denial     of service (kernel oops) by causing the device to be     removed while it is in use.

  - CVE-2013-1792     Mateusz Guzik of Red Hat EMEA GSS SEG Team discovered a     race condition in the access key retention support in     the kernel. A local user could cause a denial of service     (NULL pointer dereference).

  - CVE-2013-1796     Andrew Honig of Google reported an issue in the KVM     subsystem. A user in a guest operating system could     corrupt kernel memory, resulting in a denial of service.

  - CVE-2013-1798     Andrew Honig of Google reported an issue in the KVM     subsystem. A user in a guest operating system could     cause a denial of service due to a use after-free     defect.

  - CVE-2013-1826     Mathias Krause discovered an issue in the Transformation     (XFRM) user configuration interface of the networking     stack. A user with the CAP_NET_ADMIN capability may be     able to gain elevated privileges.

  - CVE-2013-1860     Oliver Neukum discovered an issue in the USB CDC WCM     Device Management driver. Local users with the ability     to attach devices can cause a denial of service (kernel     crash) or potentially gain elevated privileges.

  - CVE-2013-1928     Kees Cook provided a fix for an information leak in the     VIDEO_SET_SPU_PALETTE ioctl for 32-bit applications     running on a 64-bit kernel. Local users can gain access     to sensitive kernel memory.

  - CVE-2013-1929     Oded Horovitz and Brad Spengler reported an issue in the     device driver for Broadcom Tigon3 based gigabit     Ethernet. Users with the ability to attach untrusted     devices can create an overflow condition, resulting in a     denial of service or elevated privileges.

  - CVE-2013-2015     Theodore Ts'o provided a fix for an issue in the ext4     filesystem. Local users with the ability to mount a     specially crafted filesystem can cause a denial of     service (infinite loop).

  - CVE-2013-2634     Mathias Krause discovered a few issues in the Data     Center Bridging (DCB) netlink interface. Local users can     gain access to sensitive kernel memory.

  - CVE-2013-3222     Mathias Krause discovered an issue in the Asynchronous     Transfer Mode (ATM) protocol support. Local users can     gain access to sensitive kernel memory.

  - CVE-2013-3223     Mathias Krause discovered an issue in the Amateur Radio     AX.25 protocol support. Local users can gain access to     sensitive kernel memory.

  - CVE-2013-3224     Mathias Krause discovered an issue in the Bluetooth     subsystem. Local users can gain access to sensitive     kernel memory.

  - CVE-2013-3225     Mathias Krause discovered an issue in the Bluetooth     RFCOMM protocol support. Local users can gain access to     sensitive kernel memory.

  - CVE-2013-3228     Mathias Krause discovered an issue in the IrDA     (infrared) subsystem support. Local users can gain     access to sensitive kernel memory.

  - CVE-2013-3229     Mathias Krause discovered an issue in the IUCV support     on s390 systems. Local users can gain access to     sensitive kernel memory.

  - CVE-2013-3231     Mathias Krause discovered an issue in the ANSI/IEEE     802.2 LLC type 2 protocol support. Local users can gain     access to sensitive kernel memory.

  - CVE-2013-3234     Mathias Krause discovered an issue in the Amateur Radio     X.25 PLP (Rose) protocol support. Local users can gain     access to sensitive kernel memory.

  - CVE-2013-3235     Mathias Krause discovered an issue in the Transparent     Inter Process Communication (TIPC) protocol support.
    Local users can gain access to sensitive kernel memory.

ID	名稱	產品	系列	已發布	已更新	嚴重性
71204	Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-2037-1)	Nessus	Ubuntu Local Security Checks	2013/12/4	2019/9/19	medium
59321	Ubuntu 11.04 : linux vulnerabilities (USN-1457-1)	Nessus	Ubuntu Local Security Checks	2012/6/1	2019/9/19	high
217673	Linux Distros Unpatched Vulnerability : CVE-2012-2121	Nessus	Misc.	2025/3/4	2026/7/5	high
291450	MiracleLinux 3 : kvm-83-266.0.1.AXS3.1 (AXSA:2014-242:01)	Nessus	Miracle Linux Local Security Checks	2026/1/19	2026/1/19	high
59212	CentOS 5 : kvm (CESA-2012:0676)	Nessus	CentOS Local Security Checks	2012/5/22	2021/1/4	medium
59496	USN-1474-1 : linux-ti-omap4 vulnerabilities	Nessus	Ubuntu Local Security Checks	2012/6/14	2016/12/1	high
61315	Scientific Linux Security Update : kvm on SL5.x x86_64 (20120521)	Nessus	Scientific Linux Local Security Checks	2012/8/1	2021/1/14	medium
66431	Debian DSA-2668-1 : linux-2.6 - privilege escalation/denial of service/information leak	Nessus	Debian Local Security Checks	2013/5/15	2021/1/11	medium

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