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Ubuntu 11.10: USN-1648-1 Critical: Kernel Flaws Leading to DoS

ubuntu
Calendar Grey November 30, 2012
Scroller Ubuntu
Ubuntu 11.10 users should install a crucial kernel update now, as it addresses critical vulnerabilities that could lead to security risks and attacks
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 kernel system update critical flaw ubuntu linux kernel

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-28-generic    3.0.0-28.45
  linux-image-3.0.0-28-generic-pae  3.0.0-28.45
  linux-image-3.0.0-28-omap       3.0.0-28.45
  linux-image-3.0.0-28-powerpc    3.0.0-28.45
  linux-image-3.0.0-28-powerpc-smp  3.0.0-28.45
  linux-image-3.0.0-28-powerpc64-smp  3.0.0-28.45
  linux-image-3.0.0-28-server     3.0.0-28.45
  linux-image-3.0.0-28-virtual    3.0.0-28.45

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-1648-1

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 kernel system update critical flaw ubuntu linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-28.45

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