USN-1899-1: Linux kernel vulnerabilities

4 July 2013

linux vulnerabilities

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

  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. (CVE-2012-4508)

Dave Jones discovered that the Linux kernel’s socket subsystem does not correctly ensure the keepalive action is associated with a stream socket. A local user could exploit this flaw to cause a denial of service (system crash) by creating a raw socket. (CVE-2012-6657)

An information leak was discovered in the Linux kernel’s tkill and tgkill system calls when used from compat processes. A local user could exploit this flaw to examine potentially sensitive kernel memory. (CVE-2013-2141)

Kees Cook discovered a format string vulnerability in the Broadcom B43 wireless driver for the Linux kernel. A local user could exploit this flaw to gain administrative privileges. (CVE-2013-2852)

Update instructions

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

Ubuntu 10.04 LTS
linux-image-2.6.32-49-386 - 2.6.32-49.111
linux-image-2.6.32-49-generic - 2.6.32-49.111
linux-image-2.6.32-49-generic-pae - 2.6.32-49.111
linux-image-2.6.32-49-ia64 - 2.6.32-49.111
linux-image-2.6.32-49-lpia - 2.6.32-49.111
linux-image-2.6.32-49-powerpc - 2.6.32-49.111
linux-image-2.6.32-49-powerpc-smp - 2.6.32-49.111
linux-image-2.6.32-49-powerpc64-smp - 2.6.32-49.111
linux-image-2.6.32-49-preempt - 2.6.32-49.111
linux-image-2.6.32-49-server - 2.6.32-49.111
linux-image-2.6.32-49-sparc64 - 2.6.32-49.111
linux-image-2.6.32-49-sparc64-smp - 2.6.32-49.111
linux-image-2.6.32-49-versatile - 2.6.32-49.111
linux-image-2.6.32-49-virtual - 2.6.32-49.111

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