The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:0496 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux     operating system.

    This update fixes the following security issues:

    * A race condition was found in the way asynchronous I/O and fallocate()     interacted when using the ext4 file system. A local, unprivileged user     could use this flaw to expose random data from an extent whose data blocks     have not yet been written, and thus contain data from a deleted file.
    (CVE-2012-4508, Important)

    * A flaw was found in the way the vhost kernel module handled descriptors     that spanned multiple regions. A privileged guest user in a KVM guest could     use this flaw to crash the host or, potentially, escalate their privileges     on the host. (CVE-2013-0311, Important)

    * It was found that the default SCSI command filter does not accommodate     commands that overlap across device classes. A privileged guest user could     potentially use this flaw to write arbitrary data to a LUN that is     passed-through as read-only. (CVE-2012-4542, Moderate)

    * A flaw was found in the way the xen_failsafe_callback() function in the     Linux kernel handled the failed iret (interrupt return) instruction     notification from the Xen hypervisor. An unprivileged user in a 32-bit     para-virtualized guest could use this flaw to crash the guest.
    (CVE-2013-0190, Moderate)

    * A flaw was found in the way pmd_present() interacted with PROT_NONE     memory ranges when transparent hugepages were in use. A local, unprivileged     user could use this flaw to crash the system. (CVE-2013-0309, Moderate)

    * A flaw was found in the way CIPSO (Common IP Security Option) IP options     were validated when set from user mode. A local user able to set CIPSO IP     options on the socket could use this flaw to crash the system.
    (CVE-2013-0310, Moderate)

    Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508, and     Andrew Cooper of Citrix for reporting CVE-2013-0190. Upstream acknowledges     Dmitry Monakhov as the original reporter of CVE-2012-4508. The     CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

    This update also fixes several hundred bugs and adds enhancements. Refer to     the Red Hat Enterprise Linux 6.4 Release Notes for information on the most     significant of these changes, and the Technical Notes for further     information, both linked to in the References.

    All Red Hat Enterprise Linux 6 users are advised to install these updated     packages, which correct these issues, and fix the bugs and add the     enhancements noted in the Red Hat Enterprise Linux 6.4 Release Notes and     Technical Notes. The system must be rebooted for this update to take     effect.

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

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

Linux v3.6.5, latest upstream stable release with fixes across the tree.

Fixes CVE-2012-4565 and CVE-2012-4508. Updates kernel module signing to match the upstream kernel, and updates the UEFI secure boot patch set.

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

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2012:1540 advisory.

  - kernel: rds-ping cause kernel panic (CVE-2012-2372)

  - kernel: net: slab corruption due to improper synchronization around inet->opt (CVE-2012-3552)

  - kernel: ext4: AIO vs fallocate stale data exposure (CVE-2012-4508)

  - kernel: xen: VCPU timer overflow leads to PCPU deadlock and host death-by-watchdog (CVE-2012-4535)

  - kernel: xen: Memory mapping failure can crash Xen (CVE-2012-4537)

  - kernel: xen: XENMEM_exchange may overwrite hypervisor memory (CVE-2012-5513)

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

Updated kernel packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 6.2 Extended Update Support.

The Red Hat Security Response Team has rated this update as having important 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.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

* A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. (CVE-2012-4508, Important)

* An information leak flaw was found in the way Linux kernel's device mapper subsystem, under certain conditions, interpreted data written to snapshot block devices. An attacker could use this flaw to read data from disk blocks in free space, which are normally inaccessible.
(CVE-2013-4299, Moderate)

Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508, and Fujitsu for reporting CVE-2013-4299. Upstream acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508.

This update also fixes the following bugs :

* When the Audit subsystem was under heavy load, it could loop infinitely in the audit_log_start() function instead of failing over to the error recovery code. This would cause soft lockups in the kernel. With this update, the timeout condition in the audit_log_start() function has been modified to properly fail over when necessary. (BZ#1017898)

* When handling Memory Type Range Registers (MTRRs), the stop_one_cpu_nowait() function could potentially be executed in parallel with the stop_machine() function, which resulted in a deadlock. The MTRR handling logic now uses the stop_machine() function and makes use of mutual exclusion to avoid the aforementioned deadlock. (BZ#1017902)

* Power-limit notification interrupts were enabled by default. This could lead to degradation of system performance or even render the system unusable on certain platforms, such as Dell PowerEdge servers.
Power-limit notification interrupts have been disabled by default and a new kernel command line parameter 'int_pln_enable' has been added to allow users to observe these events using the existing system counters. Power-limit notification messages are also no longer displayed on the console. The affected platforms no longer suffer from degraded system performance due to this problem. (BZ#1020519)

* Package level thermal and power limit events are not defined as MCE errors for the x86 architecture. However, the mcelog utility erroneously reported these events as MCE errors with the following message :

kernel: [Hardware Error]: Machine check events logged

Package level thermal and power limit events are no longer reported as MCE errors by mcelog. When these events are triggered, they are now reported only in the respective counters in sysfs (specifically, /sys/devices/system/cpu/cpu/thermal_throttle/). (BZ#1021950)

* An insufficiently designed calculation in the CPU accelerator could cause an arithmetic overflow in the set_cyc2ns_scale() function if the system uptime exceeded 208 days prior to using kexec to boot into a new kernel. This overflow led to a kernel panic on systems using the Time Stamp Counter (TSC) clock source, primarily systems using Intel Xeon E5 processors that do not reset TSC on soft power cycles. A patch has been applied to modify the calculation so that this arithmetic overflow and kernel panic can no longer occur under these circumstances. (BZ#1024453)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

ID	名稱	產品	系列	已發布	已更新	嚴重性
65171	RHEL 6 : Red Hat Enterprise Linux 6 kernel update (Important) (RHSA-2013:0496)	Nessus	Red Hat Local Security Checks	2013/3/10	2025/4/15	high
62851	Fedora 18 : kernel-3.6.5-2.fc18 (2012-17413)	Nessus	Fedora Local Security Checks	2012/11/8	2021/1/11	medium
63152	RHEL 5 : kernel (RHSA-2012:1540)	Nessus	Red Hat Local Security Checks	2012/12/5	2024/4/27	medium
78978	RHEL 6 : kernel (RHSA-2013:1519)	Nessus	Red Hat Local Security Checks	2014/11/8	2021/1/14	medium

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