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USN-1285-1: Linux kernel vulnerabilities

29 November 2011

Several security issues were fixed in the kernel.

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Releases

Packages

Details

Andrea Righi discovered a race condition in the KSM memory merging support.
If KSM was being used, a local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2183)

Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly
handled unlock requests. A local attacker could exploit this to cause a
denial of service. (CVE-2011-2491)

Vasiliy Kulikov discovered that taskstats did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2494)

Vasiliy Kulikov discovered that /proc/PID/io did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2495)

It was discovered that the wireless stack incorrectly verified SSID
lengths. A local attacker could exploit this to cause a denial of service
or gain root privileges. (CVE-2011-2517)

Christian Ohm discovered that the perf command looks for configuration
files in the current directory. If a privileged user were tricked into
running perf in a directory containing a malicious configuration file, an
attacker could run arbitrary commands and possibly gain privileges.
(CVE-2011-2905)

Vasiliy Kulikov discovered that the Comedi driver did not correctly clear
memory. A local attacker could exploit this to read kernel stack memory,
leading to a loss of privacy. (CVE-2011-2909)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 11.04

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

Related notices

  • USN-1272-1: linux-image-2.6.35-31-server, linux-image-2.6.35-31-powerpc64-smp, linux-image-2.6.35-31-omap, linux-image-2.6.35-31-powerpc, linux, linux-image-2.6.35-31-powerpc-smp, linux-image-2.6.35-31-versatile, linux-image-2.6.35-31-generic, linux-image-2.6.35-31-generic-pae, linux-image-2.6.35-31-virtual
  • USN-1281-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4
  • USN-1203-1: linux-image-2.6.32-218-dove, linux-mvl-dove
  • USN-1279-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-13-server, linux-image-2.6.38-13-virtual
  • USN-1278-1: linux-image-2.6.35-31-server, linux-image-2.6.35-31-generic, linux-lts-backport-maverick, linux-image-2.6.35-31-generic-pae, linux-image-2.6.35-31-virtual
  • USN-1218-1: linux-image-2.6.32-34-386, linux-image-2.6.32-34-generic, linux-image-2.6.32-34-ia64, linux-image-2.6.32-34-virtual, linux, linux-image-2.6.32-34-lpia, linux-image-2.6.32-34-powerpc-smp, linux-image-2.6.32-34-server, linux-image-2.6.32-34-sparc64-smp, linux-image-2.6.32-34-powerpc, linux-image-2.6.32-34-powerpc64-smp, linux-image-2.6.32-34-sparc64, linux-image-2.6.32-34-preempt, linux-image-2.6.32-34-versatile, linux-image-2.6.32-34-generic-pae
  • USN-1244-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1208-1: linux-image-2.6.32-418-dove, linux-mvl-dove
  • USN-1216-1: linux-ec2, linux-image-2.6.32-318-ec2
  • USN-1269-1: linux-ec2, linux-image-2.6.32-340-ec2
  • USN-1286-1: linux-image-2.6.32-36-server, linux-image-2.6.32-36-ia64, linux, linux-image-2.6.32-36-sparc64, linux-image-2.6.32-36-386, linux-image-2.6.32-36-virtual, linux-image-2.6.32-36-generic, linux-image-2.6.32-36-preempt, linux-image-2.6.32-36-powerpc64-smp, linux-image-2.6.32-36-generic-pae, linux-image-2.6.32-36-lpia, linux-image-2.6.32-36-sparc64-smp, linux-image-2.6.32-36-versatile, linux-image-2.6.32-36-powerpc, linux-image-2.6.32-36-powerpc-smp
  • USN-1268-1: linux-image-2.6.24-30-lpiacompat, linux-image-2.6.24-30-hppa64, linux-image-2.6.24-30-generic, linux-image-2.6.24-30-server, linux-image-2.6.24-30-hppa32, linux-image-2.6.24-30-openvz, linux-image-2.6.24-30-sparc64-smp, linux, linux-image-2.6.24-30-itanium, linux-image-2.6.24-30-sparc64, linux-image-2.6.24-30-lpia, linux-image-2.6.24-30-386, linux-image-2.6.24-30-virtual, linux-image-2.6.24-30-mckinley, linux-image-2.6.24-30-powerpc, linux-image-2.6.24-30-rt, linux-image-2.6.24-30-powerpc64-smp, linux-image-2.6.24-30-powerpc-smp, linux-image-2.6.24-30-xen
  • USN-1274-1: linux-image-2.6.32-420-dove, linux-mvl-dove
  • USN-1271-1: linux-image-2.6.31-612-imx51, linux-fsl-imx51
  • USN-1294-1: linux-image-3.0.0-13-generic, linux-image-3.0.0-13-generic-pae, linux-lts-backport-oneiric, linux-image-3.0.0-13-virtual, linux-image-3.0.0-13-server
  • USN-1241-1: linux-fsl-imx51, linux-image-2.6.31-611-imx51
  • USN-1243-1: linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-versatile, linux, linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-powerpc64-smp, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-omap, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-server, linux-image-2.6.35-30-virtual
  • USN-1253-1: linux-image-2.6.32-35-sparc64, linux-image-2.6.32-35-sparc64-smp, linux-image-2.6.32-35-versatile, linux, linux-image-2.6.32-35-lpia, linux-image-2.6.32-35-powerpc64-smp, linux-image-2.6.32-35-powerpc-smp, linux-image-2.6.32-35-generic, linux-image-2.6.32-35-386, linux-image-2.6.32-35-virtual, linux-image-2.6.32-35-generic-pae, linux-image-2.6.32-35-preempt, linux-image-2.6.32-35-server, linux-image-2.6.32-35-powerpc, linux-image-2.6.32-35-ia64
  • USN-1239-1: linux-image-2.6.32-319-ec2, linux-ec2
  • USN-1236-1: linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-386, linux, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-server, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-sparc64-smp, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-xen, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-itanium, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-powerpc-smp
  • USN-1275-1: linux, linux-image-3.0.0-13-generic, linux-image-3.0.0-13-generic-pae, linux-image-3.0.0-13-powerpc64-smp, linux-image-3.0.0-13-omap, linux-image-3.0.0-13-powerpc-smp, linux-image-3.0.0-13-virtual, linux-image-3.0.0-13-server, linux-image-3.0.0-13-powerpc
  • USN-1240-1: linux-image-2.6.32-219-dove, linux-mvl-dove
  • USN-1260-1: linux-image-3.0.0-1206-omap4, linux-ti-omap4
  • USN-1245-1: linux-image-2.6.32-419-dove, linux-mvl-dove
  • USN-1242-1: linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-server, linux-image-2.6.35-30-generic, linux-lts-backport-maverick, linux-image-2.6.35-30-virtual