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Ubuntu: New Linux kernel packages fix security vulnerabilities

A flaw was found in the Linux’s kernels ext4 file system when mounted with a journal. A local, unprivileged user could exploit this flaw to cause a denial of service. 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-1445-1
May 18, 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:

A flaw was found in the Linux's kernels ext4 file system when mounted with
a journal. A local, unprivileged user could exploit this flaw to cause a
denial of service. (CVE-2011-4086)

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 10.04 LTS:
 linux-image-2.6.32-41-386       2.6.32-41.89
 linux-image-2.6.32-41-generic   2.6.32-41.89
 linux-image-2.6.32-41-generic-pae  2.6.32-41.89
 linux-image-2.6.32-41-ia64      2.6.32-41.89
 linux-image-2.6.32-41-lpia      2.6.32-41.89
 linux-image-2.6.32-41-powerpc   2.6.32-41.89
 linux-image-2.6.32-41-powerpc-smp  2.6.32-41.89
 linux-image-2.6.32-41-powerpc64-smp  2.6.32-41.89
 linux-image-2.6.32-41-preempt   2.6.32-41.89
 linux-image-2.6.32-41-server    2.6.32-41.89
 linux-image-2.6.32-41-sparc64   2.6.32-41.89
 linux-image-2.6.32-41-sparc64-smp  2.6.32-41.89
 linux-image-2.6.32-41-versatile  2.6.32-41.89
 linux-image-2.6.32-41-virtual   2.6.32-41.89

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
 http://www.ubuntu.com/usn/usn-1445-1
 CVE-2011-4086, CVE-2012-1601, CVE-2012-2123

Package Information:
 https://launchpad.net/ubuntu/+source/linux/2.6.32-41.89
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