[RHSA-2012:1087-01] Important: kernel security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2012:1087-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1087.html

Issue date: 2012-07-17

CVE Names: CVE-2012-2136

=====================================================================

 

1. Summary:

 

Updated kernel packages that fix one security issue and multiple bugs are

now available for Red Hat Enterprise Linux 5.6 Extended Update Support.

 

The Red Hat Security Response Team has rated this update as having

important security impact. A Common Vulnerability Scoring System (CVSS)

base score, which gives a detailed severity rating, is available from the

CVE link in the References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux EUS (v. 5.6 server) - i386, ia64, noarch, ppc, s390x, x86_64

 

3. Description:

 

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 the data_len parameter of the sock_alloc_send_pskb()

function in the Linux kernel's networking implementation was not validated

before use. A local user with access to a TUN/TAP virtual interface could

use this flaw to crash the system or, potentially, escalate their

privileges. Note that unprivileged users cannot access TUN/TAP devices

until the root user grants them access. (CVE-2012-2136, Important)

 

This update also fixes the following bugs:

 

* An insufficiently designed calculation in the CPU accelerator in the

previous kernel caused an arithmetic overflow in the sched_clock() function

when system uptime exceeded 208.5 days. This overflow led to a kernel panic

on the systems using the Time Stamp Counter (TSC) or Virtual Machine

Interface (VMI) clock source. This update corrects the described

calculation so that this arithmetic overflow and kernel panic can no longer

occur under these circumstances. (BZ#825981, BZ#835449)

 

* Previously, a race condition between the journal_write_metadata_buffer()

and jbd_unlock_bh_state() functions could occur. Consequently, another

thread could call the get_write_access() function on the buffer head and

cause the wrong data to be written into the journal. If the system

terminated unexpectedly or was shut down incorrectly, subsequent file

system journal replay could result in file system corruption. This update

fixes the race condition and the file system corruption no longer occurs in

the described scenario. (BZ#833764)

 

* When the kvmclock initialization was used in a guest, it could write to

the Time Stamp Counter (TSC) and, under certain circumstances, could cause

the kernel to become unresponsive on boot. With this update, TSC

synchronization, which is unnecessary due to kvmclock, has been disabled,

thus fixing this bug. (BZ#834557)

 

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.

 

4. 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.

 

5. Bugs fixed (http://bugzilla.redhat.com/):

 

816289 - CVE-2012-2136 kernel: net: insufficient data_len validation in sock_alloc_send_pskb()

 

6. Package List:

 

Red Hat Enterprise Linux EUS (v. 5.6 server):

 

Source:

kernel-2.6.18-238.40.1.el5.src.rpm

 

i386:

kernel-2.6.18-238.40.1.el5.i686.rpm

kernel-PAE-2.6.18-238.40.1.el5.i686.rpm

kernel-PAE-debuginfo-2.6.18-238.40.1.el5.i686.rpm

kernel-PAE-devel-2.6.18-238.40.1.el5.i686.rpm

kernel-debug-2.6.18-238.40.1.el5.i686.rpm

kernel-debug-debuginfo-2.6.18-238.40.1.el5.i686.rpm

kernel-debug-devel-2.6.18-238.40.1.el5.i686.rpm

kernel-debuginfo-2.6.18-238.40.1.el5.i686.rpm

kernel-debuginfo-common-2.6.18-238.40.1.el5.i686.rpm

kernel-devel-2.6.18-238.40.1.el5.i686.rpm

kernel-headers-2.6.18-238.40.1.el5.i386.rpm

kernel-xen-2.6.18-238.40.1.el5.i686.rpm

kernel-xen-debuginfo-2.6.18-238.40.1.el5.i686.rpm

kernel-xen-devel-2.6.18-238.40.1.el5.i686.rpm

 

ia64:

kernel-2.6.18-238.40.1.el5.ia64.rpm

kernel-debug-2.6.18-238.40.1.el5.ia64.rpm

kernel-debug-debuginfo-2.6.18-238.40.1.el5.ia64.rpm

kernel-debug-devel-2.6.18-238.40.1.el5.ia64.rpm

kernel-debuginfo-2.6.18-238.40.1.el5.ia64.rpm

kernel-debuginfo-common-2.6.18-238.40.1.el5.ia64.rpm

kernel-devel-2.6.18-238.40.1.el5.ia64.rpm

kernel-headers-2.6.18-238.40.1.el5.ia64.rpm

kernel-xen-2.6.18-238.40.1.el5.ia64.rpm

kernel-xen-debuginfo-2.6.18-238.40.1.el5.ia64.rpm

kernel-xen-devel-2.6.18-238.40.1.el5.ia64.rpm

 

noarch:

kernel-doc-2.6.18-238.40.1.el5.noarch.rpm

 

ppc:

kernel-2.6.18-238.40.1.el5.ppc64.rpm

kernel-debug-2.6.18-238.40.1.el5.ppc64.rpm

kernel-debug-debuginfo-2.6.18-238.40.1.el5.ppc64.rpm

kernel-debug-devel-2.6.18-238.40.1.el5.ppc64.rpm

kernel-debuginfo-2.6.18-238.40.1.el5.ppc64.rpm

kernel-debuginfo-common-2.6.18-238.40.1.el5.ppc64.rpm

kernel-devel-2.6.18-238.40.1.el5.ppc64.rpm

kernel-headers-2.6.18-238.40.1.el5.ppc.rpm

kernel-headers-2.6.18-238.40.1.el5.ppc64.rpm

kernel-kdump-2.6.18-238.40.1.el5.ppc64.rpm

kernel-kdump-debuginfo-2.6.18-238.40.1.el5.ppc64.rpm

kernel-kdump-devel-2.6.18-238.40.1.el5.ppc64.rpm

 

s390x:

kernel-2.6.18-238.40.1.el5.s390x.rpm

kernel-debug-2.6.18-238.40.1.el5.s390x.rpm

kernel-debug-debuginfo-2.6.18-238.40.1.el5.s390x.rpm

kernel-debug-devel-2.6.18-238.40.1.el5.s390x.rpm

kernel-debuginfo-2.6.18-238.40.1.el5.s390x.rpm

kernel-debuginfo-common-2.6.18-238.40.1.el5.s390x.rpm

kernel-devel-2.6.18-238.40.1.el5.s390x.rpm

kernel-headers-2.6.18-238.40.1.el5.s390x.rpm

kernel-kdump-2.6.18-238.40.1.el5.s390x.rpm

kernel-kdump-debuginfo-2.6.18-238.40.1.el5.s390x.rpm

kernel-kdump-devel-2.6.18-238.40.1.el5.s390x.rpm

 

x86_64:

kernel-2.6.18-238.40.1.el5.x86_64.rpm

kernel-debug-2.6.18-238.40.1.el5.x86_64.rpm

kernel-debug-debuginfo-2.6.18-238.40.1.el5.x86_64.rpm

kernel-debug-devel-2.6.18-238.40.1.el5.x86_64.rpm

kernel-debuginfo-2.6.18-238.40.1.el5.x86_64.rpm

kernel-debuginfo-common-2.6.18-238.40.1.el5.x86_64.rpm

kernel-devel-2.6.18-238.40.1.el5.x86_64.rpm

kernel-headers-2.6.18-238.40.1.el5.x86_64.rpm

kernel-xen-2.6.18-238.40.1.el5.x86_64.rpm

kernel-xen-debuginfo-2.6.18-238.40.1.el5.x86_64.rpm

kernel-xen-devel-2.6.18-238.40.1.el5.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/#package

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2012-2136.html

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2012 Red Hat, Inc.

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