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USN-1268-1: Linux kernel vulnerabilities

21 November 2011

Several security issues were fixed in the kernel.

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Releases

Packages

Details

It was discovered that CIFS incorrectly handled authentication. When a user
had a CIFS share mounted that required authentication, a local user could
mount the same share without knowing the correct password. (CVE-2011-1585)

It was discovered that the GRE protocol incorrectly handled netns
initialization. A remote attacker could send a packet while the ip_gre
module was loading, and crash the system, leading to a denial of service.
(CVE-2011-1767)

It was discovered that the IP/IP protocol incorrectly handled netns
initialization. A remote attacker could send a packet while the ipip module
was loading, and crash the system, leading to a denial of service.
(CVE-2011-1768)

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)

Robert Swiecki discovered that mapping extensions were incorrectly handled.
A local attacker could exploit this to crash the system, leading to a
denial of service. (CVE-2011-2496)

Ben Pfaff discovered that Classless Queuing Disciplines (qdiscs) were being
incorrectly handled. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2525)

Yasuaki Ishimatsu discovered a flaw in the kernel's clock implementation. A
local unprivileged attacker could exploit this causing a denial of service.
(CVE-2011-3209)

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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.

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Update instructions

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

Ubuntu 8.04

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.

References

Related notices

  • USN-1272-1: linux-image-2.6.35-31-powerpc64-smp, linux, linux-image-2.6.35-31-generic, linux-image-2.6.35-31-powerpc, linux-image-2.6.35-31-omap, linux-image-2.6.35-31-powerpc-smp, linux-image-2.6.35-31-server, linux-image-2.6.35-31-versatile, linux-image-2.6.35-31-virtual, linux-image-2.6.35-31-generic-pae
  • USN-1280-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1203-1: linux-image-2.6.32-218-dove, linux-mvl-dove
  • USN-1278-1: linux-image-2.6.35-31-generic, linux-lts-backport-maverick, linux-image-2.6.35-31-server, linux-image-2.6.35-31-virtual, linux-image-2.6.35-31-generic-pae
  • USN-1218-1: linux, linux-image-2.6.32-34-preempt, linux-image-2.6.32-34-sparc64-smp, linux-image-2.6.32-34-386, linux-image-2.6.32-34-virtual, linux-image-2.6.32-34-sparc64, linux-image-2.6.32-34-powerpc, linux-image-2.6.32-34-powerpc64-smp, linux-image-2.6.32-34-versatile, linux-image-2.6.32-34-generic, linux-image-2.6.32-34-powerpc-smp, linux-image-2.6.32-34-server, linux-image-2.6.32-34-generic-pae, linux-image-2.6.32-34-ia64, linux-image-2.6.32-34-lpia
  • USN-1208-1: linux-image-2.6.32-418-dove, linux-mvl-dove
  • USN-1256-1: linux-image-2.6.38-12-virtual, linux-image-2.6.38-12-server, linux-image-2.6.38-12-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-12-generic
  • USN-1216-1: linux-ec2, linux-image-2.6.32-318-ec2
  • USN-1271-1: linux-image-2.6.31-612-imx51, linux-fsl-imx51
  • USN-1269-1: linux-ec2, linux-image-2.6.32-340-ec2
  • USN-1286-1: linux, linux-image-2.6.32-36-powerpc64-smp, linux-image-2.6.32-36-powerpc, linux-image-2.6.32-36-versatile, linux-image-2.6.32-36-ia64, linux-image-2.6.32-36-386, linux-image-2.6.32-36-generic-pae, linux-image-2.6.32-36-generic, linux-image-2.6.32-36-powerpc-smp, linux-image-2.6.32-36-lpia, linux-image-2.6.32-36-virtual, linux-image-2.6.32-36-preempt, linux-image-2.6.32-36-sparc64, linux-image-2.6.32-36-server, linux-image-2.6.32-36-sparc64-smp
  • USN-1281-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1285-1: linux, linux-image-2.6.38-13-powerpc-smp, linux-image-2.6.38-13-powerpc64-smp, linux-image-2.6.38-13-server, linux-image-2.6.38-13-generic, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-powerpc, linux-image-2.6.38-13-omap, linux-image-2.6.38-13-versatile
  • USN-1274-1: linux-mvl-dove, linux-image-2.6.32-420-dove
  • USN-1279-1: linux-image-2.6.38-13-server, linux-image-2.6.38-13-generic, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-generic-pae, linux-lts-backport-natty
  • USN-1244-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1241-1: linux-image-2.6.31-611-imx51, linux-fsl-imx51
  • USN-1167-1: linux-image-2.6.38-10-virtual, linux-image-2.6.38-10-powerpc64-smp, linux, linux-image-2.6.38-10-versatile, linux-image-2.6.38-10-powerpc, linux-image-2.6.38-10-powerpc-smp, linux-image-2.6.38-10-generic-pae, linux-image-2.6.38-10-server, linux-image-2.6.38-10-omap, linux-image-2.6.38-10-generic
  • USN-1294-1: linux-image-3.0.0-13-server, linux-lts-backport-oneiric, linux-image-3.0.0-13-generic-pae, linux-image-3.0.0-13-generic, linux-image-3.0.0-13-virtual

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Further reading