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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2011:1163
The remote host is missing updates announced in
advisory RHSA-2011:1163.

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

This update includes backported fixes for two security issues. These issues
only affected users of Red Hat Enterprise Linux 5.6 Extended Update
Support, as they have already been addressed for users of Red Hat
Enterprise Linux 5 in the 5.7 update, RHSA-2011:1065.

This update fixes the following security issues:

* A flaw was found in the way the Xen hypervisor implementation handled
instruction emulation during virtual machine exits. A malicious user-space
process running in an SMP guest could trick the emulator into reading a
different instruction than the one that caused the virtual machine to exit.
An unprivileged guest user could trigger this flaw to crash the host. This
only affects systems with both an AMD x86 processor and the AMD
Virtualization (AMD-V) extensions enabled. (CVE-2011-1780, Important)

* A flaw allowed the tc_fill_qdisc() function in the Linux kernel's packet
scheduler API implementation to be called on built-in qdisc structures. A
local, unprivileged user could use this flaw to trigger a NULL pointer
dereference, resulting in a denial of service. (CVE-2011-2525, Moderate)

This update also fixes the following bugs:

* A bug was found in the way the x86_emulate() function handled the IMUL
instruction in the Xen hypervisor. On systems without support for hardware
assisted paging (HAP), such as those running CPUs that do not have support
for (or those that have it disabled) Intel Extended Page Tables (EPT) or
AMD Virtualization (AMD-V) Rapid Virtualization Indexing (RVI), this bug
could cause fully-virtualized guests to crash or lead to silent memory
corruption. In reported cases, this issue occurred when booting
fully-virtualized Red Hat Enterprise Linux 6.1 guests with memory cgroups
enabled. (BZ#712884)

* A bug in the way the ibmvscsi driver handled interrupts may have
prevented automatic path recovery for multipath devices. This bug only
affected 64-bit PowerPC systems. (BZ#720929)

* The RHSA-2009:1243 update introduced a regression in the way file locking
on NFS (Network File System) was handled. This caused applications to hang
if they made a lock request on a file on an NFS version 2 or 3 file system
that was mounted with the sec=krb5 option. With this update, the original
behavior of using mixed RPC authentication flavors for NFS and locking
requests has been restored. (BZ#722854)

Users should upgrade to these updated packages, which contain backported
patches to resolve these issues. The system must be rebooted for this
update to take effect.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-1780
RedHat Security Advisories: RHSA-2011:1065
RedHat Security Advisories: RHSA-2011:1163
Common Vulnerability Exposure (CVE) ID: CVE-2011-2525
CopyrightCopyright (c) 2011 E-Soft Inc.

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