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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2012:0720
The remote host is missing updates announced in
advisory RHSA-2012:0720.

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 Xen hypervisor implementation as shipped with Red
Hat Enterprise Linux 5 did not properly restrict the syscall return
addresses in the sysret return path to canonical addresses. An
unprivileged user in a 64-bit para-virtualized guest, that is running on a
64-bit host that has an Intel CPU, could use this flaw to crash the host
or, potentially, escalate their privileges, allowing them to execute
arbitrary code at the hypervisor level. (CVE-2012-0217, Important)

Note: For Red Hat Enterprise Linux guests, only privileged guest users can
exploit CVE-2012-0217.

* A flaw in the xfrm6_tunnel_rcv() function in the Linux kernel's IPv6
implementation could lead to a use-after-free or double free flaw in
tunnel6_rcv(). A remote attacker could use this flaw to send
specially-crafted packets to a target system that is using IPv6 and also
has the xfrm6_tunnel kernel module loaded, causing it to crash.
(CVE-2012-1583, Important)

If you do not run applications that use xfrm6_tunnel, you can prevent the
xfrm6_tunnel module from being loaded by creating (as the root user) a
/etc/modprobe.d/xfrm6_tunnel.conf file, and adding the following line to

blacklist xfrm6_tunnel

This way, the xfrm6_tunnel module cannot be loaded accidentally. A reboot
is not necessary for this change to take effect.

Red Hat would like to thank the Xen project for reporting CVE-2012-0217.
Upstream acknowledges Rafal Wojtczuk as the original reporter of

This update also fixes the following bugs:

* Under rare circumstances, a bug in the vsyscall interface caused the gdb
debugger to terminate unexpectedly with a segmentation fault when run on
the AMD64 or Intel 64 architecture. A patch has been provided to address
this issue and the crashes no longer occur in the described scenario.

* Incorrect duplicate MAC addresses were being used on a rack network
daughter card that contained a quad-port Intel I350 Gigabit Ethernet
Controller. With this update, the underlying source code has been modified
to address this issue, and correct MAC addresses are now used under all
circumstances. (BZ#813195)

* When the Fibre Channel (FC) layer sets a device to running, the layer
also scans for other new devices. Previously, there was a race condition
between these two operations. Consequently, for certain targets, thousands
of invalid devices were created by the SCSI layer and the udev service.
This update ensures that the FC layer always sets a device to online
before scanning for others, thus fixing this bug.

Additionally, when attempting to transition priority groups on a busy FC
device, the multipath layer retried immediately. If this was the only
available path, a large number of retry operations were performed in a
short period of time. Consequently, the logging of retry messages slowed
down the system. This bug has been fixed by ensuring that the DM Multipath
feature delays retry operations in the described scenario. (BZ#816683)

* Due to incorrect use of the list_for_each_entry_safe() macro, the
enumeration of remote procedure calls (RPCs) priority wait queue tasks
stored in the tk_wait.links list failed. As a consequence, the
rpc_wake_up() and rpc_wake_up_status() functions failed to wake up all
tasks. This caused the system to become unresponsive and could
significantly decrease system performance. Now, the
list_for_each_entry_safe() macro is no longer used in rpc_wake_up(),
ensuring reasonable system performance. (BZ#817570)

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.

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-2012-0217
Cert/CC Advisory: TA12-164A
CERT/CC vulnerability note: VU#649219
Debian Security Information: DSA-2501 (Google Search)
Debian Security Information: DSA-2508 (Google Search)
FreeBSD Security Advisory: FreeBSD-SA-12:04
Microsoft Security Bulletin: MS12-042
NETBSD Security Advisory: NetBSD-SA2012-003
Common Vulnerability Exposure (CVE) ID: CVE-2012-1583
BugTraq ID: 53139
HPdes Security Advisory: HPSBMU02776
HPdes Security Advisory: SSRT100852
RedHat Security Advisories: RHSA-2012:0488
CopyrightCopyright (c) 2012 E-Soft Inc.

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