Ubuntu Security Notice USN-1431-1
30th April, 2012
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
Several security issues were fixed in the kernel.
- linux - Linux kernel
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)
Sasha Levin discovered a flaw in the permission checking for device
assignments requested via the kvm ioctl in the Linux kernel. A local user
could use this flaw to crash the system causing a denial of service.
Stephan Bärwolf discovered a flaw in the KVM (kernel-based virtual
machine) subsystem of the Linux kernel. A local unprivileged user can crash
use this flaw to crash VMs causing a deny of service. (CVE-2012-0045)
A flaw was discovered in the Linux kernel's cifs file system. An
unprivileged local user could exploit this flaw to crash the system leading
to a denial of service. (CVE-2012-1090)
H. Peter Anvin reported a flaw in the Linux kernel that could crash the
system. A local user could exploit this flaw to crash the system.
A flaw was discovered in the Linux kernel's cgroups subset. A local
attacker could use this flaw to crash the system. (CVE-2012-1146)
A flaw was found in the Linux kernel's handling of paged memory. A local
unprivileged user, or a privileged user within a KVM guest, could exploit
this flaw to crash the system. (CVE-2012-1179)
Tetsuo Handa reported a flaw in the OOM (out of memory) killer of the Linux
kernel. A local unprivileged user can exploit this flaw to cause system
unstability and denial of services. (CVE-2012-4398)
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- linux-image-3.0.0-19-generic-pae 3.0.0-19.33
- linux-image-3.0.0-19-powerpc 3.0.0-19.33
- linux-image-3.0.0-19-server 3.0.0-19.33
- linux-image-3.0.0-19-omap 3.0.0-19.33
- linux-image-3.0.0-19-generic 3.0.0-19.33
- linux-image-3.0.0-19-powerpc-smp 3.0.0-19.33
- linux-image-3.0.0-19-powerpc64-smp 3.0.0-19.33
- linux-image-3.0.0-19-virtual 3.0.0-19.33
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.