USN-2178-1: Linux kernel vulnerabilities
Ubuntu Security Notice USN-2178-1
26th April, 2014
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.10
Several security issues were fixed in the kernel.
- linux - Linux kernel
A flaw was discovered in the Kernel Virtual Machine (KVM) subsystem of the
Linux kernel. A guest OS user could exploit this flaw to execute arbitrary
code on the host OS. (CVE-2014-0049)
Al Viro discovered an error in how CIFS in the Linux kernel handles
uncached write operations. An unprivileged local user could exploit this
flaw to cause a denial of service (system crash), obtain sensitive
information from kernel memory, or possibly gain privileges.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 12.10:
- linux-image-3.5.0-49-highbank 3.5.0-49.73
- linux-image-3.5.0-49-omap 3.5.0-49.73
- linux-image-3.5.0-49-powerpc64-smp 3.5.0-49.73
- linux-image-3.5.0-49-generic 3.5.0-49.73
- linux-image-3.5.0-49-powerpc-smp 3.5.0-49.73
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.