Issued:

2011-06-01

Updated:

2011-06-01

RHSA-2011:0836 - Important: kernel security and bug fix update

Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory Important

Topic

Updated kernel packages that fix multiple security issues and various bugs are now available for Red Hat Enterprise Linux 6.

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

This update fixes the following security issues:

• An integer underflow flaw, leading to a buffer overflow, was found in the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation. This could allow a remote attacker to cause a denial of service. (CVE-2011-1770, Important)

• Missing sanity checks were found in setup_arg_pages() in the Linux kernel. When making the size of the argument and environment area on the stack very large, it could trigger a BUG_ON(), resulting in a local denial of service. (CVE-2010-3858, Moderate)

• A missing validation check was found in the bcm_release() and raw_release() functions in the Linux kernel's Controller Area Network (CAN) implementation. This could allow a local, unprivileged user to cause a denial of service. (CVE-2011-1598, CVE-2011-1748, Moderate)

• The fix for Red Hat Bugzilla bug 656461, as provided in RHSA-2011:0542, introduced a regression in the cifs_close() function in the Linux kernel's Common Internet File System (CIFS) implementation. A local, unprivileged user with write access to a CIFS file system could use this flaw to cause a denial of service. (CVE-2011-1771, Moderate)

Red Hat would like to thank Dan Rosenberg for reporting CVE-2011-1770; Brad Spengler for reporting CVE-2010-3858; and Oliver Hartkopp for reporting CVE-2011-1748.

This update also fixes various bugs. Documentation for these bug fixes will be available shortly from the Technical Notes document linked to in the References section.

Users should upgrade to these updated packages, which contain backported patches to resolve these issues, and fix the bugs noted in the Technical Notes. 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 This content is not included.https://access.redhat.com/kb/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

Updated Packages

• kernel-devel-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-debug-2.6.32-131.2.1.el6.s390x.rpm
• kernel-headers-2.6.32-131.2.1.el6.s390x.rpm
• perf-2.6.32-131.2.1.el6.i686.rpm
• kernel-debuginfo-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-debug-devel-2.6.32-131.2.1.el6.i686.rpm
• kernel-debuginfo-2.6.32-131.2.1.el6.i686.rpm
• kernel-debug-devel-2.6.32-131.2.1.el6.x86_64.rpm
• kernel-debug-devel-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-devel-2.6.32-131.2.1.el6.i686.rpm
• kernel-debuginfo-2.6.32-131.2.1.el6.s390x.rpm
• kernel-2.6.32-131.2.1.el6.s390x.rpm
• kernel-debug-debuginfo-2.6.32-131.2.1.el6.i686.rpm
• kernel-debug-2.6.32-131.2.1.el6.x86_64.rpm
• perf-debuginfo-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-debuginfo-common-s390x-2.6.32-131.2.1.el6.s390x.rpm
• kernel-kdump-devel-2.6.32-131.2.1.el6.s390x.rpm
• perf-2.6.32-131.2.1.el6.s390x.rpm
• kernel-debug-devel-2.6.32-131.2.1.el6.s390x.rpm
• kernel-debuginfo-common-i686-2.6.32-131.2.1.el6.i686.rpm
• kernel-2.6.32-131.2.1.el6.i686.rpm
• kernel-2.6.32-131.2.1.el6.x86_64.rpm
• perf-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-doc-2.6.32-131.2.1.el6.noarch.rpm
• kernel-kdump-debuginfo-2.6.32-131.2.1.el6.s390x.rpm
• kernel-debug-debuginfo-2.6.32-131.2.1.el6.x86_64.rpm
• perf-debuginfo-2.6.32-131.2.1.el6.s390x.rpm
• kernel-debug-debuginfo-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-kdump-2.6.32-131.2.1.el6.s390x.rpm
• perf-debuginfo-2.6.32-131.2.1.el6.x86_64.rpm
• kernel-devel-2.6.32-131.2.1.el6.x86_64.rpm
• kernel-debug-2.6.32-131.2.1.el6.i686.rpm
• kernel-2.6.32-131.2.1.el6.src.rpm
• kernel-firmware-2.6.32-131.2.1.el6.noarch.rpm
• kernel-headers-2.6.32-131.2.1.el6.x86_64.rpm
• kernel-headers-2.6.32-131.2.1.el6.ppc64.rpm
• perf-debuginfo-2.6.32-131.2.1.el6.i686.rpm
• kernel-debug-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-debuginfo-2.6.32-131.2.1.el6.x86_64.rpm
• kernel-debuginfo-common-x86_64-2.6.32-131.2.1.el6.x86_64.rpm
• perf-2.6.32-131.2.1.el6.x86_64.rpm
• kernel-bootwrapper-2.6.32-131.2.1.el6.ppc64.rpm
• kernel-debug-debuginfo-2.6.32-131.2.1.el6.s390x.rpm
• kernel-devel-2.6.32-131.2.1.el6.s390x.rpm
• kernel-headers-2.6.32-131.2.1.el6.i686.rpm
• kernel-debuginfo-common-ppc64-2.6.32-131.2.1.el6.ppc64.rpm

Fixes

• This content is not included.BZ - 645222
• This content is not included.BZ - 698057
• This content is not included.BZ - 703011
• This content is not included.BZ - 703016
• This content is not included.BZ - 704014

CVEs

• CVE-2010-3858
• CVE-2011-1748
• CVE-2011-1770
• CVE-2011-1598
• CVE-2011-1771

References

• https://access.redhat.com/security/updates/classification/#important
• https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/kernel.html#RHSA-2011-0836

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.