RHSA-2010:0758 - Security Advisory

Topic

Updated kernel-rt packages that fix two security issues and three bugs are
now available for Red Hat Enterprise MRG 1.2.

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.

Description

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

This update fixes the following security issues:

• The compat_alloc_user_space() function in the Linux kernel 32/64-bit

compatibility layer implementation was missing sanity checks. This function
could be abused in other areas of the Linux kernel if its length argument
can be controlled from user-space. On 64-bit systems, a local, unprivileged
user could use this flaw to escalate their privileges. (CVE-2010-3081,
Important)

• A missing upper bound integer check was found in the sys_io_submit()

function in the Linux kernel asynchronous I/O implementation. A local,
unprivileged user could use this flaw to cause an information leak.
(CVE-2010-3067, Low)

Red Hat would like to thank Ben Hawkes for reporting CVE-2010-3081, and
Tavis Ormandy for reporting CVE-2010-3067.

This update also fixes the following bugs:

• The RHSA-2010:0631 kernel-rt update resolved an issue (CVE-2010-2240)

where, when an application has a stack overflow, the stack could silently
overwrite another memory mapped area instead of a segmentation fault
occurring. This update implements the official upstream fixes for that
issue. Note: This is not a security regression. The original fix was
complete. (BZ#624604)

• In certain circumstances, under heavy load, certain network interface

cards using the bnx2 driver, and configured to use MSI-X, could stop
processing interrupts and then network connectivity would cease.
(BZ#622952)

• This update upgrades the tg3 driver to version 3.110. (BZ#640334)

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.

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
http://kbase.redhat.com/faq/docs/DOC-11259

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 1 x86_64
• MRG Realtime 1 i386

Fixes

• BZ - 624604 - Backport official CVE-2010-2240 fixes
• BZ - 629441 - CVE-2010-3067 kernel: do_io_submit() infoleak
• BZ - 634457 - CVE-2010-3081 kernel: 64-bit Compatibility Mode Stack Pointer Underflow
• BZ - 640334 - update MRG 1.2 tg3 driver to latest upstream driver

CVEs

• CVE-2010-3067
• CVE-2010-3081

References

• http://www.redhat.com/security/updates/classification/#important
• https://access.redhat.com/kb/docs/DOC-40265