RHSA-2011:0283 - Security Advisory

Topic

Updated kernel packages that fix three security issues, several bugs, and
add two enhancements 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:

• A divide-by-zero flaw was found in the tcp_select_initial_window()

function in the Linux kernel's TCP/IP protocol suite implementation. A
local, unprivileged user could use this flaw to trigger a denial of service
by calling setsockopt() with certain options. (CVE-2010-4165, Moderate)

• A use-after-free flaw in the mprotect() system call in the Linux kernel

could allow a local, unprivileged user to cause a local denial of service.
(CVE-2010-4169, Moderate)

• A flaw was found in the Linux kernel execve() system call implementation.

A local, unprivileged user could cause large amounts of memory to be
allocated but not visible to the OOM (Out of Memory) killer, triggering a
denial of service. (CVE-2010-4243, Moderate)

Red Hat would like to thank Steve Chen for reporting CVE-2010-4165, and
Brad Spengler for reporting CVE-2010-4243.

This update also fixes several bugs and adds two enhancements.
Documentation for these bug fixes and enhancements 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 correct these issues, and fix the bugs and add the enhancements
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
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

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 625688 - CVE-2010-4243 kernel: mm: mem allocated invisible to oom_kill() when not attached to any threads
• BZ - 651671 - CVE-2010-4169 kernel: perf bug
• BZ - 652508 - CVE-2010-4165 kernel: possible kernel oops from user MSS
• BZ - 652720 - read from virtio-serial returns if the host side is not connect to pipe [rhel-6.0.z]
• BZ - 658854 - [NetApp 6.1 bug] RHEL6.0 FC host hits kernel panic at scsi_error_handler [rhel-6.0.z]
• BZ - 658891 - [6.0.z FEAT] Port KVM bug fixes for cr_access to RHEL 6 [rhel-6.0.z]
• BZ - 659610 - [NetApp 6.1 bug] SCSI ALUA handler fails to handle ALUA transitioning properly [rhel-6.0.z]
• BZ - 660590 - [NetApp 6.1 bug] regression: allow offlined devs to be set to running [rhel-6.0.z]
• BZ - 661730 - NFS4 clients cannot reclaim locks after server reboot [rhel-6.0.z]
• BZ - 661731 - kernel: Problem with execve(2) reintroduced [rhel-6.1] [rhel-6.0.z]
• BZ - 661737 - xen PV guest kernel 2.6.32 processes lock up in D state [rhel-6.0.z]
• BZ - 662721 - Fix hot-unplug handling of virtio-console ports [rhel-6.0.z]
• BZ - 662921 - UV: WAR for interrupt-IOPort deadlock [rhel-6.0.z]
• BZ - 664398 - QLogic qla2xxx: Backport critical parts of 8.03.05.01.06.1-k0 to [rhel-6.0.z]
• BZ - 671342 - System panic in pskb_expand_head When arp_validate option is specified in bonding ARP monitor mode [rhel-6.0.z]
• BZ - 673978 - [NetApp 6.0 Bug] Erroneous TPG ID check in SCSI ALUA Handler [rhel-6.0.z]

CVEs

• CVE-2010-4169
• CVE-2010-4243
• CVE-2010-4165

References

• https://access.redhat.com/security/updates/classification/#moderate
• http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Technical_Notes/ape.html#RHSA-2011-0283