USN-1431-1: Linux kernel vulnerabilities

Releases

• Ubuntu 11.10

Packages

• 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)

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.
(CVE-2011-4347)

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.
(CVE-2012-1097)

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)

Update instructions

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

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

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

• CVE-2012-4398
• CVE-2012-1090
• CVE-2012-1179
• CVE-2011-4086
• CVE-2011-4347
• CVE-2012-0045
• CVE-2012-1097
• CVE-2012-1146

Related notices

• USN-1440-1: linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-server, linux-lts-backport-natty
• USN-1425-1: linux-image-2.6.32-41-ia64, linux-image-2.6.32-41-powerpc64-smp, linux, linux-image-2.6.32-41-generic-pae, linux-image-2.6.32-41-lpia, linux-image-2.6.32-41-server, linux-image-2.6.32-41-virtual, linux-image-2.6.32-41-preempt, linux-image-2.6.32-41-sparc64-smp, linux-image-2.6.32-41-sparc64, linux-image-2.6.32-41-versatile, linux-image-2.6.32-41-generic, linux-image-2.6.32-41-386, linux-image-2.6.32-41-powerpc, linux-image-2.6.32-41-powerpc-smp
• USN-1433-1: linux-image-3.0.0-19-generic-pae, linux-image-3.0.0-19-server, linux-lts-backport-oneiric, linux-image-3.0.0-19-generic, linux-image-3.0.0-19-virtual
• USN-1446-1: linux-ti-omap4, linux-image-3.0.0-1209-omap4
• USN-1432-1: linux-image-2.6.38-15-generic-pae, linux, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-powerpc-smp, linux-image-2.6.38-15-powerpc64-smp, linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-omap, linux-image-2.6.38-15-server, linux-image-2.6.38-15-versatile, linux-image-2.6.38-15-powerpc
• USN-1426-1: linux-image-2.6.32-345-ec2, linux-ec2
• USN-1458-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
• USN-1453-1: linux-image-2.6.32-345-ec2, linux-ec2
• USN-1454-1: linux-image-2.6.24-31-sparc64, linux-image-2.6.24-31-hppa32, linux-image-2.6.24-31-openvz, linux-image-2.6.24-31-xen, linux-image-2.6.24-31-itanium, linux-image-2.6.24-31-sparc64-smp, linux-image-2.6.24-31-powerpc, linux-image-2.6.24-31-server, linux-image-2.6.24-31-386, linux-image-2.6.24-31-powerpc-smp, linux-image-2.6.24-31-lpiacompat, linux, linux-image-2.6.24-31-mckinley, linux-image-2.6.24-31-rt, linux-image-2.6.24-31-virtual, linux-image-2.6.24-31-hppa64, linux-image-2.6.24-31-generic, linux-image-2.6.24-31-lpia, linux-image-2.6.24-31-powerpc64-smp
• USN-1445-1: linux-image-2.6.32-41-ia64, linux-image-2.6.32-41-powerpc64-smp, linux, linux-image-2.6.32-41-generic-pae, linux-image-2.6.32-41-lpia, linux-image-2.6.32-41-server, linux-image-2.6.32-41-virtual, linux-image-2.6.32-41-preempt, linux-image-2.6.32-41-sparc64-smp, linux-image-2.6.32-41-sparc64, linux-image-2.6.32-41-versatile, linux-image-2.6.32-41-generic, linux-image-2.6.32-41-386, linux-image-2.6.32-41-powerpc, linux-image-2.6.32-41-powerpc-smp
• USN-1421-1: linux-image-2.6.35-32-generic, linux-image-2.6.35-32-generic-pae, linux-image-2.6.35-32-virtual, linux-lts-backport-maverick, linux-image-2.6.35-32-server
• USN-1422-1: linux-image-2.6.38-14-omap, linux, linux-image-2.6.38-14-powerpc64-smp, linux-image-2.6.38-14-versatile, linux-image-2.6.38-14-generic, linux-image-2.6.38-14-generic-pae, linux-image-2.6.38-14-powerpc-smp, linux-image-2.6.38-14-server, linux-image-2.6.38-14-virtual, linux-image-2.6.38-14-powerpc