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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2012:1540-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1540.html
Issue date:        2012-12-04
CVE Names:         CVE-2012-2372 CVE-2012-3552 CVE-2012-4508 
                   CVE-2012-4535 CVE-2012-4537 CVE-2012-5513 
=====================================================================

1. Summary:

Updated kernel packages that fix multiple security issues, two bugs, and
add two enhancements are now available for Red Hat Enterprise Linux 5.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, noarch, x86_64

3. Description:

These packages contain the Linux kernel.

Security fixes:

* A race condition in the way asynchronous I/O and fallocate() interacted
when using ext4 could allow a local, unprivileged user to obtain random
data from a deleted file. (CVE-2012-4508, Important)

* A flaw in the way the Xen hypervisor implementation range checked guest
provided addresses in the XENMEM_exchange hypercall could allow a
malicious, para-virtualized guest administrator to crash the hypervisor or,
potentially, escalate their privileges, allowing them to execute arbitrary
code at the hypervisor level. (CVE-2012-5513, Important)

* A flaw in the Reliable Datagram Sockets (RDS) protocol implementation
could allow a local, unprivileged user to cause a denial of service.
(CVE-2012-2372, Moderate)

* A race condition in the way access to inet->opt ip_options was
synchronized in the Linux kernel's TCP/IP protocol suite implementation.
Depending on the network facing applications running on the system, a
remote attacker could possibly trigger this flaw to cause a denial of
service. A local, unprivileged user could use this flaw to cause a denial
of service regardless of the applications the system runs. (CVE-2012-3552,
Moderate)

* The Xen hypervisor implementation did not properly restrict the period
values used to initialize per VCPU periodic timers. A privileged guest user
could cause an infinite loop on the physical CPU. If the watchdog were
enabled, it would detect said loop and panic the host system.
(CVE-2012-4535, Moderate)

* A flaw in the way the Xen hypervisor implementation handled
set_p2m_entry() error conditions could allow a privileged,
fully-virtualized guest user to crash the hypervisor. (CVE-2012-4537,
Moderate)

Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508; the
Xen project for reporting CVE-2012-5513, CVE-2012-4535, and CVE-2012-4537;
and Hafid Lin for reporting CVE-2012-3552. Upstream acknowledges Dmitry
Monakhov as the original reporter of CVE-2012-4508. CVE-2012-2372 was
discovered by Li Honggang of Red Hat.

Bug fixes:

* Previously, the interrupt handlers of the qla2xxx driver could clear
pending interrupts right after the IRQ lines were attached during system
start-up. Consequently, the kernel could miss the interrupt that reported
completion of the link initialization, and the qla2xxx driver then failed
to detect all attached LUNs. With this update, the qla2xxx driver has been
modified to no longer clear interrupt bits after attaching the IRQ lines.
The driver now correctly detects all attached LUNs as expected. (BZ#870118)

* The Ethernet channel bonding driver reported the MII (Media Independent
Interface) status of the bond interface in 802.3ad mode as being up even
though the MII status of all of the slave devices was down. This could pose
a problem if the MII status of the bond interface was used to determine if
failover should occur. With this update, the agg_device_up() function has
been added to the bonding driver, which allows the driver to report the
link status of the bond interface correctly, that is, down when all of its
slaves are down, in the 802.3ad mode. (BZ#877943)

Enhancements:

* This update backports several changes from the latest upstream version of
the bnx2x driver. The most important change, the remote-fault link
detection feature, allows the driver to periodically scan the physical link
layer for remote faults. If the physical link appears to be up and a fault
is detected, the driver indicates that the link is down. When the fault is
cleared, the driver indicates that the link is up again. (BZ#870120)

* The INET socket interface has been modified to send a warning message
when the ip_options structure is allocated directly by a third-party module
using the kmalloc() function. (BZ#874973)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues and add these enhancements. 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 (https://bugzilla.redhat.com/):

822754 - CVE-2012-2372 kernel: rds-ping cause kernel panic
853465 - CVE-2012-3552 kernel: net: slab corruption due to improper synchronization around inet->opt
869904 - CVE-2012-4508 kernel: ext4: AIO vs fallocate stale data exposure
870086 - CVE-2012-4535 kernel: xen: VCPU timer overflow leads to PCPU deadlock and host death-by-watchdog
870101 - CVE-2012-4537 kernel: xen: Memory mapping failure can crash Xen
874973 - net: WARN if struct ip_options was allocated directly by kmalloc [rhel-5.8.z]
877391 - CVE-2012-5513 kernel: xen: XENMEM_exchange may overwrite hypervisor memory

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kernel-2.6.18-308.24.1.el5.src.rpm

i386:
kernel-2.6.18-308.24.1.el5.i686.rpm
kernel-PAE-2.6.18-308.24.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-308.24.1.el5.i686.rpm
kernel-debug-2.6.18-308.24.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.i686.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.i686.rpm
kernel-devel-2.6.18-308.24.1.el5.i686.rpm
kernel-headers-2.6.18-308.24.1.el5.i386.rpm
kernel-xen-2.6.18-308.24.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-xen-devel-2.6.18-308.24.1.el5.i686.rpm

noarch:
kernel-doc-2.6.18-308.24.1.el5.noarch.rpm

x86_64:
kernel-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debug-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.x86_64.rpm
kernel-devel-2.6.18-308.24.1.el5.x86_64.rpm
kernel-headers-2.6.18-308.24.1.el5.x86_64.rpm
kernel-xen-2.6.18-308.24.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-308.24.1.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kernel-2.6.18-308.24.1.el5.src.rpm

i386:
kernel-2.6.18-308.24.1.el5.i686.rpm
kernel-PAE-2.6.18-308.24.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-308.24.1.el5.i686.rpm
kernel-debug-2.6.18-308.24.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.i686.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.i686.rpm
kernel-devel-2.6.18-308.24.1.el5.i686.rpm
kernel-headers-2.6.18-308.24.1.el5.i386.rpm
kernel-xen-2.6.18-308.24.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-308.24.1.el5.i686.rpm
kernel-xen-devel-2.6.18-308.24.1.el5.i686.rpm

ia64:
kernel-2.6.18-308.24.1.el5.ia64.rpm
kernel-debug-2.6.18-308.24.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.ia64.rpm
kernel-devel-2.6.18-308.24.1.el5.ia64.rpm
kernel-headers-2.6.18-308.24.1.el5.ia64.rpm
kernel-xen-2.6.18-308.24.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-308.24.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-308.24.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-308.24.1.el5.noarch.rpm

ppc:
kernel-2.6.18-308.24.1.el5.ppc64.rpm
kernel-debug-2.6.18-308.24.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.ppc64.rpm
kernel-devel-2.6.18-308.24.1.el5.ppc64.rpm
kernel-headers-2.6.18-308.24.1.el5.ppc.rpm
kernel-headers-2.6.18-308.24.1.el5.ppc64.rpm
kernel-kdump-2.6.18-308.24.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-308.24.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-308.24.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-308.24.1.el5.s390x.rpm
kernel-debug-2.6.18-308.24.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.s390x.rpm
kernel-devel-2.6.18-308.24.1.el5.s390x.rpm
kernel-headers-2.6.18-308.24.1.el5.s390x.rpm
kernel-kdump-2.6.18-308.24.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-308.24.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-308.24.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debug-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-308.24.1.el5.x86_64.rpm
kernel-devel-2.6.18-308.24.1.el5.x86_64.rpm
kernel-headers-2.6.18-308.24.1.el5.x86_64.rpm
kernel-xen-2.6.18-308.24.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-308.24.1.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-2012-2372.html
https://www.redhat.com/security/data/cve/CVE-2012-3552.html
https://www.redhat.com/security/data/cve/CVE-2012-4508.html
https://www.redhat.com/security/data/cve/CVE-2012-4535.html
https://www.redhat.com/security/data/cve/CVE-2012-4537.html
https://www.redhat.com/security/data/cve/CVE-2012-5513.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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