Issued:

2011-07-12

Updated:

2011-07-12

RHSA-2011:0928 - Moderate: kernel security and bug fix update

Synopsis

Moderate: kernel security and bug fix update

Type/Severity

Security Advisory Moderate

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

This update fixes the following security issues:

• It was found that the receive hook in the ipip_init() function in the ipip module, and in the ipgre_init() function in the ip_gre module, could be called before network namespaces setup is complete. If packets were received at the time the ipip or ip_gre module was still being loaded into the kernel, it could cause a denial of service. (CVE-2011-1767, CVE-2011-1768, Moderate)

• It was found that an mmap() call with the MAP_PRIVATE flag on "/dev/zero" would create transparent hugepages and trigger a certain robustness check. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2011-2479, Moderate)

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-2.6.32-131.6.1.el6.i686.rpm
• kernel-debug-devel-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debuginfo-common-x86_64-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-headers-2.6.32-131.6.1.el6.x86_64.rpm
• perf-debuginfo-2.6.32-131.6.1.el6.i686.rpm
• kernel-headers-2.6.32-131.6.1.el6.i686.rpm
• kernel-debuginfo-2.6.32-131.6.1.el6.i686.rpm
• kernel-debuginfo-2.6.32-131.6.1.el6.ppc64.rpm
• perf-2.6.32-131.6.1.el6.i686.rpm
• kernel-devel-2.6.32-131.6.1.el6.s390x.rpm
• perf-2.6.32-131.6.1.el6.s390x.rpm
• kernel-debuginfo-common-i686-2.6.32-131.6.1.el6.i686.rpm
• kernel-debuginfo-common-ppc64-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debug-devel-2.6.32-131.6.1.el6.i686.rpm
• perf-debuginfo-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debug-2.6.32-131.6.1.el6.i686.rpm
• kernel-doc-2.6.32-131.6.1.el6.noarch.rpm
• kernel-firmware-2.6.32-131.6.1.el6.noarch.rpm
• kernel-bootwrapper-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debug-debuginfo-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-headers-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debug-debuginfo-2.6.32-131.6.1.el6.s390x.rpm
• kernel-debug-devel-2.6.32-131.6.1.el6.s390x.rpm
• kernel-devel-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debuginfo-2.6.32-131.6.1.el6.s390x.rpm
• kernel-devel-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-2.6.32-131.6.1.el6.src.rpm
• perf-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-debug-debuginfo-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-2.6.32-131.6.1.el6.s390x.rpm
• kernel-kdump-2.6.32-131.6.1.el6.s390x.rpm
• kernel-debuginfo-2.6.32-131.6.1.el6.x86_64.rpm
• perf-2.6.32-131.6.1.el6.ppc64.rpm
• kernel-debug-debuginfo-2.6.32-131.6.1.el6.i686.rpm
• kernel-devel-2.6.32-131.6.1.el6.i686.rpm
• kernel-debug-devel-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-headers-2.6.32-131.6.1.el6.s390x.rpm
• kernel-debuginfo-common-s390x-2.6.32-131.6.1.el6.s390x.rpm
• kernel-kdump-devel-2.6.32-131.6.1.el6.s390x.rpm
• kernel-kdump-debuginfo-2.6.32-131.6.1.el6.s390x.rpm
• perf-debuginfo-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-debug-2.6.32-131.6.1.el6.x86_64.rpm
• kernel-debug-2.6.32-131.6.1.el6.ppc64.rpm
• perf-debuginfo-2.6.32-131.6.1.el6.s390x.rpm
• kernel-debug-2.6.32-131.6.1.el6.s390x.rpm

Fixes

• This content is not included.BZ - 702303
• This content is not included.BZ - 711546
• This content is not included.BZ - 712413
• This content is not included.BZ - 712414
• This content is not included.BZ - 713135
• This content is not included.BZ - 713458
• This content is not included.BZ - 714190
• This content is not included.BZ - 714761

CVEs

• CVE-2011-2479
• CVE-2011-1767
• CVE-2011-1768

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/kernel.html#RHSA-2011-0928

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.