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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2012:1087
The remote host is missing updates announced in
advisory RHSA-2012:1087.

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

This update fixes the following security issue:

* It was found that the data_len parameter of the sock_alloc_send_pskb()
function in the Linux kernel's networking implementation was not validated
before use. A local user with access to a TUN/TAP virtual interface could
use this flaw to crash the system or, potentially, escalate their
privileges. Note that unprivileged users cannot access TUN/TAP devices
until the root user grants them access. (CVE-2012-2136, Important)

This update also fixes the following bugs:

* An insufficiently designed calculation in the CPU accelerator in the
previous kernel caused an arithmetic overflow in the sched_clock() function
when system uptime exceeded 208.5 days. This overflow led to a kernel panic
on the systems using the Time Stamp Counter (TSC) or Virtual Machine
Interface (VMI) clock source. This update corrects the described
calculation so that this arithmetic overflow and kernel panic can no longer
occur under these circumstances. (BZ#825981, BZ#835449)

* Previously, a race condition between the journal_write_metadata_buffer()
and jbd_unlock_bh_state() functions could occur. Consequently, another
thread could call the get_write_access() function on the buffer head and
cause the wrong data to be written into the journal. If the system
terminated unexpectedly or was shut down incorrectly, subsequent file
system journal replay could result in file system corruption. This update
fixes the race condition and the file system corruption no longer occurs in
the described scenario. (BZ#833764)

* When the kvmclock initialization was used in a guest, it could write to
the Time Stamp Counter (TSC) and, under certain circumstances, could cause
the kernel to become unresponsive on boot. With this update, TSC
synchronization, which is unnecessary due to kvmclock, has been disabled,
thus fixing this bug. (BZ#834557)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2012-2136
BugTraq ID: 53721
RedHat Security Advisories: RHSA-2012:0743
RedHat Security Advisories: RHSA-2012:1087
CopyrightCopyright (c) 2012 E-Soft Inc.

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