USN-1533-1: Linux kernel vulnerabilities

10 August 2012

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 11.10

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)

An error was discovered in the Linux kernel’s memory subsystem (hugetlb). An unprivileged local user could exploit this flaw to cause a denial of service (crash the system). (CVE-2012-2390)

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 to crash the system. (CVE-2012-3400)

A flaw was discovered in the madvise feature of the Linux kernel’s memory subsystem. An unprivileged local use could exploit the flaw to cause a denial of service (crash the system). (CVE-2012-3511)

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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