Moderate: kernel-rt security and bug fix update

Synopsis

Moderate: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Moderate

Topic

Updated kernel-rt packages that fix two security issues and two bugs are
now available for Red Hat Enterprise MRG 2.1.

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.

Description

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

This update fixes the following security issues:

• A memory leak flaw was found in the way the Linux kernel's memory
  subsystem handled resource clean up in the mmap() failure path when the
  MAP_HUGETLB flag was set. A local, unprivileged user could use this flaw to
  cause a denial of service. (CVE-2012-2390, Moderate)
  
• A flaw was found in the way the Linux kernel's Event Poll (epoll)
  subsystem handled resource clean up when an ELOOP error code was returned.
  A local, unprivileged user could use this flaw to cause a denial of
  service. (CVE-2012-3375, Moderate)
  

This update also fixes the following bugs:

• The MRG 2.1 realtime kernel lacked support for automatic memory
  reservation for the kdump kernel, as present in Red Hat Enterprise Linux
  kernels. Using the parameter crashkernel=auto on the kernel boot command
  line led to kdump being disabled because no memory was correctly reserved.
  Support for crashkernel=auto has been implemented in the 3.0 realtime
  kernel and now when the crashkernel=auto parameter is specified, machines
  with more than 4GB of RAM have the amount of memory required by the kdump
  kernel calculated and reserved. (BZ#820427)
  
• The current bnx2x driver in the MRG 2.1 realtime kernel had faulty
  support for the network adapter PCI ID 14e4:168e and did not work
  correctly. The bnx2x driver was updated to include support for this network
  adapter. (BZ#839037)
  

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.0.36-rt57, and correct these issues. The
system must be rebooted for this update to take effect.

Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 824345 - CVE-2012-2390 kernel: huge pages: memory leak on mmap failure
• BZ - 837502 - CVE-2012-3375 kernel: epoll: can leak file descriptors when returning -ELOOP

CVEs

• CVE-2012-3375
• CVE-2012-2390

References

• https://access.redhat.com/security/updates/classification/#moderate