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Test ID:1.3.6.1.4.1.25623.1.0.870689
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2012:0052-01
Summary:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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 permissions were not checked properly in the Linux
kernel when handling the /proc/[pid]/mem writing functionality. A local,
unprivileged user could use this flaw to escalate their privileges. Refer
to Red Hat Knowledgebase article DOC-69129, linked to in the References,
for further information. (CVE-2012-0056, Important)

Red Hat would like to thank Jueri Aedla for reporting this issue.

This update fixes the following bugs:

* The RHSA-2011:1849 kernel update introduced a bug in the Linux kernel
scheduler, causing a 'WARNING: at kernel/sched.c:5915 thread_return'
message and a call trace to be logged. This message was harmless, and was
not due to any system malfunctions or adverse behavior. With this update,
the WARN_ON_ONCE() call in the scheduler that caused this harmless message
has been removed. (BZ#768288)

* The RHSA-2011:1530 kernel update introduced a regression in the way
the Linux kernel maps ELF headers for kernel modules into kernel memory.
If a third-party kernel module is compiled on a Red Hat Enterprise Linux
system with a kernel prior to RHSA-2011:1530, then loading that module on
a system with RHSA-2011:1530 kernel would result in corruption of one byte
in the memory reserved for the module. In some cases, this could prevent
the module from functioning correctly. (BZ#769595)

* On some SMP systems the tsc may erroneously be marked as unstable during
early system boot or while the system is under heavy load. A 'Clocksource
tsc unstable' message was logged when this occurred. As a result the system
would switch to the slower access, but higher precision HPET clock.

The 'tsc=reliable' kernel parameter is supposed to avoid this problem by
indicating that the system has a known good clock, however, the parameter
only affected run time checks. A fix has been put in to avoid the boot
time checks so that the TSC remains as the clock for the duration of
system runtime. (BZ#755867)

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.

Affected Software/OS:
kernel on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Solution:
Please Install the Updated Packages.

CVSS Score:
6.9

CVSS Vector:
AV:L/AC:M/Au:N/C:C/I:C/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2012-0056
BugTraq ID: 51625
http://www.securityfocus.com/bid/51625
CERT/CC vulnerability note: VU#470151
http://www.kb.cert.org/vuls/id/470151
http://blog.zx2c4.com/749
http://www.openwall.com/lists/oss-security/2012/01/18/2
http://www.openwall.com/lists/oss-security/2012/01/18/1
http://www.openwall.com/lists/oss-security/2012/01/19/4
http://www.openwall.com/lists/oss-security/2012/01/22/4
http://www.redhat.com/support/errata/RHSA-2012-0052.html
http://www.redhat.com/support/errata/RHSA-2012-0061.html
http://secunia.com/advisories/47708
http://ubuntu.com/usn/usn-1336-1
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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