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[USN-1431-1] Linux kernel vulnerabilities

Posted on 01 May 2012
Ubuntu Security

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Ubuntu Security Notice USN-1431-1
May 01, 2012

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

- Ubuntu 11.10

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 wit=
h
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 B=C3=A4rwolf discovered a flaw in the KVM (kernel-based virtual
machine) subsystem of the Linux kernel. A local unprivileged user can cra=
sh
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 leadi=
ng
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)

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 3.0.0-19.33
linux-image-3.0.0-19-generic-pae 3.0.0-19.33
linux-image-3.0.0-19-omap 3.0.0-19.33
linux-image-3.0.0-19-powerpc 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-server 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 automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-1431-1
CVE-2011-4086, CVE-2011-4347, CVE-2012-0045, CVE-2012-1090,
CVE-2012-1097, CVE-2012-1146, CVE-2012-1179

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.0.0-19.33


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