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Ubuntu 12.04 LTS USN-1644-1 Critical: Kernel Denial of Service

ubuntu
Calendar Grey November 30, 2012
Scroller Ubuntu
A patch has been released to fix critical security vulnerabilities in the Ubuntu kernel, enhancing system security and reliability for better infrastructure protection.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Brad Spengler discovered a flaw in the Linux kernel's uname system call. An

unprivileged user could exploit this flaw to read kernel stack memory.

(CVE-2012-0957)

Rodrigo Freire discovered a flaw in the Linux kernel's TCP illinois

congestion control algorithm. A local attacker could use this to cause a

denial of service. (CVE-2012-4565)

Topics%20covered

Topics Covered

security advisory denial of service critical kernel system update ubuntu linux

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-34-generic    3.2.0-34.53
  linux-image-3.2.0-34-generic-pae  3.2.0-34.53
  linux-image-3.2.0-34-highbank   3.2.0-34.53
  linux-image-3.2.0-34-omap       3.2.0-34.53
  linux-image-3.2.0-34-powerpc-smp  3.2.0-34.53
  linux-image-3.2.0-34-powerpc64-smp  3.2.0-34.53
  linux-image-3.2.0-34-virtual    3.2.0-34.53

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-2012-0957, CVE-2012-4565

Severity
critical
Lowest
Low
Medium
High
Critical

November 30, 2012

Topics%20covered

Topics Covered

security advisory denial of service critical kernel system update ubuntu linux

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-34.53

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