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Alerts This Week
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Ubuntu 11.10 USN-1322-1 Critical: Kernel Risks and Mitigations

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Calendar Grey January 9, 2012
Scroller Ubuntu
A range of kernel flaws patched in Ubuntu Security Notice USN-1323-1. Urgent update advised for all users.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Clement Lecigne discovered a bug in the HFS filesystem. A local attacker

could exploit this to cause a kernel oops. (CVE-2011-2203)

A bug was discovered in the XFS filesystem's handling of pathnames. A local

attacker could exploit this to crash the system, leading to a denial of

service, or gain root privileges. (CVE-2011-4077)

Nick Bowler discovered the kernel GHASH message digest algorithm

incorrectly handled error conditions. A local attacker could exploit this

to cause a kernel oops. (CVE-2011-4081)

A flaw was found in how the Linux kernel handles user-defined key types. An

unprivileged local user could exploit this to crash the system.

(CVE-2011-4110)

A flaw was found in the Journaling Block Device (JBD). A local attacker

able to mount ext3 or ext4 file systems could exploit this to crash the

system, leading to a denial of service. (CVE-2011-41...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory local attack system crash Ubuntu 11.10 kernel risks

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-15-generic    3.0.0-15.25
  linux-image-3.0.0-15-generic-pae  3.0.0-15.25
  linux-image-3.0.0-15-omap       3.0.0-15.25
  linux-image-3.0.0-15-powerpc    3.0.0-15.25
  linux-image-3.0.0-15-powerpc-smp  3.0.0-15.25
  linux-image-3.0.0-15-powerpc64-smp  3.0.0-15.25
  linux-image-3.0.0-15-server     3.0.0-15.25
  linux-image-3.0.0-15-virtual    3.0.0-15.25

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-1322-1

CVE-2011-2203, CVE-2011-4077, CVE-2011-4081, CVE-2011-4110,

CVE-2011-4132, CVE-2011-4330

Severity
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January 09, 2012

Topics%20covered

Topics Covered

security advisory local attack system crash Ubuntu 11.10 kernel risks

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-15.25

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