Ubuntu Security Notice USN-1487-1

29th June, 2012

linux vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

• Ubuntu 11.10

Summary

The system could be made to crash if it received specially crafted network
traffic.

Software description

• linux
  - Linux kernel
  
  

Details

A flaw was discovered in the Linux kernel's NFSv4 (Network file system)
handling of ACLs (access control lists). A remote NFS server (attacker)
could cause a denial of service (OOPS).

Update instructions

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

Ubuntu 11.10:

linux-image-3.0.0-22-virtual

3.0.0-22.36

linux-image-3.0.0-22-omap

3.0.0-22.36

linux-image-3.0.0-22-server

3.0.0-22.36

linux-image-3.0.0-22-powerpc-smp

3.0.0-22.36

linux-image-3.0.0-22-powerpc

3.0.0-22.36

linux-image-3.0.0-22-generic-pae

3.0.0-22.36

linux-image-3.0.0-22-powerpc64-smp

3.0.0-22.36

linux-image-3.0.0-22-generic

3.0.0-22.36

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2012-2375