Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel packages that fix two security issues and three 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. 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 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.

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 - Extended Update Support 5.6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 5.6 ia64
• Red Hat Enterprise Linux Server - Extended Update Support 5.6 i386
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6 i386
• Red Hat Enterprise Linux Server - AUS 5.6 x86_64
• Red Hat Enterprise Linux Server - AUS 5.6 ia64
• Red Hat Enterprise Linux Server - AUS 5.6 i386
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.6 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.6 ppc

Fixes

• BZ - 702657 - CVE-2011-1780 kernel: xen: svm: insufficiencies in handling emulated instructions during vm exits
• BZ - 712884 - RHEL6.1 32bit xen hvm guest crash randomly
• BZ - 719066 - [RHEL5.7][kernel-xen] HVM guests hang during installation on AMD systems
• BZ - 720552 - CVE-2011-2525 kernel: kernel: net_sched: fix qdisc_notify()

CVEs

• CVE-2011-2525
• CVE-2011-1780

References

• https://access.redhat.com/security/updates/classification/#important
• https://rhn.redhat.com/errata/RHSA-2011-1065.html
• https://rhn.redhat.com/errata/RHSA-2009-1243.html

Red Hat Enterprise Linux Server - Extended Update Support 5.6

SRPM
kernel-2.6.18-238.21.1.el5.src.rpm	SHA-256: 6868cba83ef0353869884012547dfbd3c0dc55e247551d4b732e50f7d4ebf166
x86_64
kernel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 8251db3a1c99f1606256e1e73ba01de8deba082c1fd5c1186b1a5a305618ba41
kernel-debug-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 7b4ed48cf03817516722c2c16df1cdfaa2eeefe9b9fb36e88ae240ddd59eb291
kernel-debug-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: a211a8ccc6e2944f1af2e1469602ffcc22cbf653d97bca29456bf59c8b09486e
kernel-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 587c940506d56ffe8d3b53d5db8e991e15bbb9148b73f8bad05b145459ea979c
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 7a045b43e034068e22bfcf51928edceda7e425a3bea00e8ca6235ed3d9ff0bb6
kernel-xen-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 3d1c6b11afd7427e33feb58694cc94ef5e514c4208246732b2d91254bff69ec7
kernel-xen-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 3040af0a6619ac5b590fc1935eabdef4549de04429ae69e723154f1505d132c7
ia64
kernel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: a97d85b738ee53083b59d0c8ed642065e51a51d7e40291130cf63ad92b1746f3
kernel-debug-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 13dd7c2a25a0f9c36309378651a2dcf5dc5cd78da5d5099db49d519b3f00de16
kernel-debug-devel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: a96788d14191f4d1ce94c28cf1a1344d16f58deb10cedba4bf1c96a2d397a7e5
kernel-devel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 62f58c2a1ad80b228bbe1b7d5be63c1f63827201851828d13961af2d84281efb
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 8f984e978c82d66ea8b2bd07f76806769736afdddac6987406bb0a33fe61dc31
kernel-xen-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: b6fc5470f5bb0ba2ee12b3e7c22095d7634426f48f865c49c8c3bdb75cebc759
kernel-xen-devel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 8e14114538981a89bb8112023e01a5d7bcd4188b9fe170ff5d4e988c08faf61d
i386
kernel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: f27f4b8805c282886e117317f761f98d59275904fc644036d91040147694481b
kernel-PAE-2.6.18-238.21.1.el5.i686.rpm	SHA-256: e43b6f3320b1eee56fe17677ca449279cd4ccdf46379ff869399f7171c9a0919
kernel-PAE-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: d39443e8e56dcded6b852aceba88961b5f9b6457ff4066eea4d07280d3b5ba76
kernel-debug-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b64b40fbce4f7646621a7d63b4f700a07f12101e4badee2d673f5ea79a8d54e7
kernel-debug-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: bd5036b545f4c929dd10e853a9d8693d027ab5181b0a56e056d3a9f348824f41
kernel-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: c451ed18cf21c664a7607c8e42922432915124e4ada5414a3bd2421d28bddc1b
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.i386.rpm	SHA-256: 78716c7cda3ed31bfa73f87d7045aabdc3bf52b27910f5fcaa316a215801398c
kernel-xen-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b07e6a52cba7d3d5718f0112c5a3f73d9e93312e5d4a5c44b7977c631a4132f9
kernel-xen-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b701f7e5819da419654629f646924d3a69f906a3fb8951291efe1faffc493e07

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.6

SRPM
kernel-2.6.18-238.21.1.el5.src.rpm	SHA-256: 6868cba83ef0353869884012547dfbd3c0dc55e247551d4b732e50f7d4ebf166
s390x
kernel-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: 33a29e04b99405decc70e315a2df6bbb7749de9dbeecbe321353601967478b46
kernel-debug-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: f4c19dbe9874c30a68cdc8c40e5f4d500eada155b1d30ee0cd2d96c7358a9b80
kernel-debug-devel-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: 597294114a7a77acb9c933a1b849b5a8be5f0aaa5b05bef1a638c0a369f1d091
kernel-devel-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: ff6785ae582c388cfd71e6dba2d60a3764598943d3b3c6c5c7e15e208297aa8c
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: 3af6ec134f4aaf0be95dd084b23463b0d80ac0853f8044e3d821fd538ef7ba73
kernel-kdump-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: 0f0b106d82e05cfe250a7196b58c2bfc653abdfbcbbbd270d15dd0ead03c05e7
kernel-kdump-devel-2.6.18-238.21.1.el5.s390x.rpm	SHA-256: 82ff24f2b268d90816fcaf9f313f07ebd26e8b699523efa76d6af13d6cff72a2

Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.6

SRPM
kernel-2.6.18-238.21.1.el5.src.rpm	SHA-256: 6868cba83ef0353869884012547dfbd3c0dc55e247551d4b732e50f7d4ebf166
ppc
kernel-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: 7c5b1190758e07bce8a768fd5150535b923cbdfe1e8beadb3c5b71b375c76b2f
kernel-debug-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: b17ba96f4d12455dacdf314b848e0f56da118e83fbecf199c99d80c0b7e55638
kernel-debug-devel-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: 6d9a6b0af7e9e47808a941622414854c4e86df6db65c3e75d4b8a445a20cd88f
kernel-devel-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: 0bbbaf07c2b7d51bb65f1e6c88e8646a7e1dba3bbd3347613a4f424794224601
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.ppc.rpm	SHA-256: 1a009c047bac97f2fb25322428dc05664fe399925c123903807d39f70acce5bb
kernel-headers-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: f91d6f1d8535d4de58bf11cc565ac384d5b32dffb9d727f4f786176baffbeebd
kernel-kdump-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: 3f48ecbac03b6b54bf40d2a10bf299a29b955de454e4f754698584b7c5b15280
kernel-kdump-devel-2.6.18-238.21.1.el5.ppc64.rpm	SHA-256: bb904594ac19d465f8cb447a423249f9e296a567956a23b1df0c209442c1d80e

Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6

SRPM
kernel-2.6.18-238.21.1.el5.src.rpm	SHA-256: 6868cba83ef0353869884012547dfbd3c0dc55e247551d4b732e50f7d4ebf166
x86_64
kernel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 8251db3a1c99f1606256e1e73ba01de8deba082c1fd5c1186b1a5a305618ba41
kernel-debug-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 7b4ed48cf03817516722c2c16df1cdfaa2eeefe9b9fb36e88ae240ddd59eb291
kernel-debug-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: a211a8ccc6e2944f1af2e1469602ffcc22cbf653d97bca29456bf59c8b09486e
kernel-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 587c940506d56ffe8d3b53d5db8e991e15bbb9148b73f8bad05b145459ea979c
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 7a045b43e034068e22bfcf51928edceda7e425a3bea00e8ca6235ed3d9ff0bb6
kernel-xen-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 3d1c6b11afd7427e33feb58694cc94ef5e514c4208246732b2d91254bff69ec7
kernel-xen-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 3040af0a6619ac5b590fc1935eabdef4549de04429ae69e723154f1505d132c7
i386
kernel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: f27f4b8805c282886e117317f761f98d59275904fc644036d91040147694481b
kernel-PAE-2.6.18-238.21.1.el5.i686.rpm	SHA-256: e43b6f3320b1eee56fe17677ca449279cd4ccdf46379ff869399f7171c9a0919
kernel-PAE-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: d39443e8e56dcded6b852aceba88961b5f9b6457ff4066eea4d07280d3b5ba76
kernel-debug-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b64b40fbce4f7646621a7d63b4f700a07f12101e4badee2d673f5ea79a8d54e7
kernel-debug-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: bd5036b545f4c929dd10e853a9d8693d027ab5181b0a56e056d3a9f348824f41
kernel-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: c451ed18cf21c664a7607c8e42922432915124e4ada5414a3bd2421d28bddc1b
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.i386.rpm	SHA-256: 78716c7cda3ed31bfa73f87d7045aabdc3bf52b27910f5fcaa316a215801398c
kernel-xen-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b07e6a52cba7d3d5718f0112c5a3f73d9e93312e5d4a5c44b7977c631a4132f9
kernel-xen-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b701f7e5819da419654629f646924d3a69f906a3fb8951291efe1faffc493e07

Red Hat Enterprise Linux Server - AUS 5.6

SRPM
kernel-2.6.18-238.21.1.el5.src.rpm	SHA-256: 6868cba83ef0353869884012547dfbd3c0dc55e247551d4b732e50f7d4ebf166
x86_64
kernel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 8251db3a1c99f1606256e1e73ba01de8deba082c1fd5c1186b1a5a305618ba41
kernel-debug-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 7b4ed48cf03817516722c2c16df1cdfaa2eeefe9b9fb36e88ae240ddd59eb291
kernel-debug-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: a211a8ccc6e2944f1af2e1469602ffcc22cbf653d97bca29456bf59c8b09486e
kernel-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 587c940506d56ffe8d3b53d5db8e991e15bbb9148b73f8bad05b145459ea979c
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 7a045b43e034068e22bfcf51928edceda7e425a3bea00e8ca6235ed3d9ff0bb6
kernel-xen-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 3d1c6b11afd7427e33feb58694cc94ef5e514c4208246732b2d91254bff69ec7
kernel-xen-devel-2.6.18-238.21.1.el5.x86_64.rpm	SHA-256: 3040af0a6619ac5b590fc1935eabdef4549de04429ae69e723154f1505d132c7
ia64
kernel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: a97d85b738ee53083b59d0c8ed642065e51a51d7e40291130cf63ad92b1746f3
kernel-debug-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 13dd7c2a25a0f9c36309378651a2dcf5dc5cd78da5d5099db49d519b3f00de16
kernel-debug-devel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: a96788d14191f4d1ce94c28cf1a1344d16f58deb10cedba4bf1c96a2d397a7e5
kernel-devel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 62f58c2a1ad80b228bbe1b7d5be63c1f63827201851828d13961af2d84281efb
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 8f984e978c82d66ea8b2bd07f76806769736afdddac6987406bb0a33fe61dc31
kernel-xen-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: b6fc5470f5bb0ba2ee12b3e7c22095d7634426f48f865c49c8c3bdb75cebc759
kernel-xen-devel-2.6.18-238.21.1.el5.ia64.rpm	SHA-256: 8e14114538981a89bb8112023e01a5d7bcd4188b9fe170ff5d4e988c08faf61d
i386
kernel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: f27f4b8805c282886e117317f761f98d59275904fc644036d91040147694481b
kernel-PAE-2.6.18-238.21.1.el5.i686.rpm	SHA-256: e43b6f3320b1eee56fe17677ca449279cd4ccdf46379ff869399f7171c9a0919
kernel-PAE-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: d39443e8e56dcded6b852aceba88961b5f9b6457ff4066eea4d07280d3b5ba76
kernel-debug-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b64b40fbce4f7646621a7d63b4f700a07f12101e4badee2d673f5ea79a8d54e7
kernel-debug-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: bd5036b545f4c929dd10e853a9d8693d027ab5181b0a56e056d3a9f348824f41
kernel-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: c451ed18cf21c664a7607c8e42922432915124e4ada5414a3bd2421d28bddc1b
kernel-doc-2.6.18-238.21.1.el5.noarch.rpm	SHA-256: e2733f734b0db02fa1fe3213ea829d5178b7e3344a821b5bb7553e03754e9231
kernel-headers-2.6.18-238.21.1.el5.i386.rpm	SHA-256: 78716c7cda3ed31bfa73f87d7045aabdc3bf52b27910f5fcaa316a215801398c
kernel-xen-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b07e6a52cba7d3d5718f0112c5a3f73d9e93312e5d4a5c44b7977c631a4132f9
kernel-xen-devel-2.6.18-238.21.1.el5.i686.rpm	SHA-256: b701f7e5819da419654629f646924d3a69f906a3fb8951291efe1faffc493e07