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Ubuntu 10.04 LTS USN-1278-1: Critical Kernel Issues Overview

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Calendar Grey November 24, 2011
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Learn how to secure your Ubuntu 10.04 LTS against kernel vulnerabilities by updating your package list, upgrading packages, and rebooting.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-backport-maverick: Linux kernel backport from Maverick

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)

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)

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)

It was discovered that the wire...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel issue ubuntu linux backport

Update Instructions

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

Ubuntu 10.04 LTS:
  linux-image-2.6.35-31-generic   2.6.35-31.62~lucid1
  linux-image-2.6.35-31-generic-pae  2.6.35-31.62~lucid1
  linux-image-2.6.35-31-server    2.6.35-31.62~lucid1
  linux-image-2.6.35-31-virtual   2.6.35-31.62~lucid1

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

https://ubuntu.com/security/notices/USN-1278-1

CVE-2011-1585, CVE-2011-2183, CVE-2011-2491, CVE-2011-2496,

CVE-2011-2517

Severity
critical
Lowest
Low
Medium
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Critical

November 24, 2011

Topics%20covered

Topics Covered

security advisory denial of service kernel issue ubuntu linux backport

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-backport-maverick/2.6.35-31.62~lucid1

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