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Ubuntu Security Notice USN-1535-1

Ubuntu Security Notice USN-1535-1
Posted Aug 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1535-1 - 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. 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). Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, root
systems | linux, ubuntu
advisories | CVE-2012-2136, CVE-2012-2390, CVE-2012-2136, CVE-2012-2390
MD5 | cf6d7fd3511ba46e569dc7497cd7b66b

Ubuntu Security Notice USN-1535-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1535-1
August 10, 2012

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:

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)

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)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-42-386 2.6.32-42.95
linux-image-2.6.32-42-generic 2.6.32-42.95
linux-image-2.6.32-42-generic-pae 2.6.32-42.95
linux-image-2.6.32-42-ia64 2.6.32-42.95
linux-image-2.6.32-42-lpia 2.6.32-42.95
linux-image-2.6.32-42-powerpc 2.6.32-42.95
linux-image-2.6.32-42-powerpc-smp 2.6.32-42.95
linux-image-2.6.32-42-powerpc64-smp 2.6.32-42.95
linux-image-2.6.32-42-preempt 2.6.32-42.95
linux-image-2.6.32-42-server 2.6.32-42.95
linux-image-2.6.32-42-sparc64 2.6.32-42.95
linux-image-2.6.32-42-sparc64-smp 2.6.32-42.95
linux-image-2.6.32-42-versatile 2.6.32-42.95
linux-image-2.6.32-42-virtual 2.6.32-42.95

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:
http://www.ubuntu.com/usn/usn-1535-1
CVE-2012-2136, CVE-2012-2390

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.32-42.95
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