Articles / Ubuntu: New Linux kernel pa...

Ubuntu: New Linux kernel packages fix security vulnerabilities

A flaw was found in the Linux kernel’s KVM (Kernel Virtual Machine) virtual cpu setup. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. Steve Grubb reported a flaw with Linux fscaps (file system base capabilities) when used to increase the permissions of a process. For application on which fscaps are in use a local attacker can disable address space randomization to make attacking the process with raised privileges easier.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1448-1
May 21, 2012

linux vulnerabilities
==========================================================================

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)

Steve Grubb reported a flaw with Linux fscaps (file system base
capabilities) when used to increase the permissions of a process. For
application on which fscaps are in use a local attacker can disable address
space randomization to make attacking the process with raised privileges
easier. (CVE-2012-2123)

Update instructions:

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

Ubuntu 12.04 LTS:
 linux-image-3.2.0-24-generic    3.2.0-24.38
 linux-image-3.2.0-24-generic-pae  3.2.0-24.38
 linux-image-3.2.0-24-omap       3.2.0-24.38
 linux-image-3.2.0-24-powerpc-smp  3.2.0-24.38
 linux-image-3.2.0-24-powerpc64-smp  3.2.0-24.38
 linux-image-3.2.0-24-virtual    3.2.0-24.38

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-1448-1
 CVE-2012-1601, CVE-2012-2123

Package Information:
 https://launchpad.net/ubuntu/+source/linux/3.2.0-24.38
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