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Ubuntu 11.10 USN-1533-1 Critical: Linux Kernel Access Issue

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Calendar Grey August 10, 2012
Scroller Ubuntu
Essential security patches for the Ubuntu kernel resolve various vulnerabilities impacting system reliability and user permissions.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

An error was discovered in the Linux kernel's network TUN/TAP device

implementation. A local user with access to the TUN/TAP interface (which is

not available to unprivileged users until granted by a root user) could

exploit this flaw to crash the system or potential gain administrative

privileges. (CVE-2012-2136)

Ulrich Obergfell discovered an error in the Linux kernel's memory

management subsystem on 32 bit PAE systems with more than 4GB of memory

installed. A local unprivileged user could exploit this flaw to crash the

system. (CVE-2012-2373)

A flaw was discovered in the Linux kernel's epoll system call. An

unprivileged local user could use this flaw to crash the system.

(CVE-2012-3375)

Some errors where discovered in the Linux kernel's UDF file system, which

is used to mount some CD-ROMs and DVDs. An unprivileged local user could

use these flaws ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical ubuntu system crash linux kernel local user threat access issues

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-24-generic    3.0.0-24.40
  linux-image-3.0.0-24-generic-pae  3.0.0-24.40
  linux-image-3.0.0-24-omap       3.0.0-24.40
  linux-image-3.0.0-24-powerpc    3.0.0-24.40
  linux-image-3.0.0-24-powerpc-smp  3.0.0-24.40
  linux-image-3.0.0-24-powerpc64-smp  3.0.0-24.40
  linux-image-3.0.0-24-server     3.0.0-24.40
  linux-image-3.0.0-24-virtual    3.0.0-24.40

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-1533-1

CVE-2012-2136, CVE-2012-2373, CVE-2012-3375, CVE-2012-3400

Severity
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August 10, 2012

Topics%20covered

Topics Covered

security advisory critical ubuntu system crash linux kernel local user threat access issues

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-24.40

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