Your submission was sent successfully! Close

Thank you for contacting us. A member of our team will be in touch shortly. Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

USN-1268-1: Linux kernel vulnerabilities

21 November 2011

Several security issues were fixed in the kernel.

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

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)

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

Join the discussion

Need help with your security needs?

Ubuntu Pro provides up to ten-year security coverage for over 23,000 open-source packages within the Ubuntu Main and Universe repositories.

Talk to an expert to find out what would work best for you

Further reading