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[USN-1696-1] Linux kernel vulnerabilities

Posted on 18 January 2013
Ubuntu Security

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Ubuntu Security Notice USN-1696-1
January 18, 2013

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtua=
l
machine) subsystem's handling of the XSAVE CPU feature. On hosts without =
the
XSAVE CPU feature, using qemu userspace, an unprivileged local attacker c=
ould
exploit this flaw to crash the system. (CVE-2012-4461)

A flaw was discovered in the Linux kernel's handling of script execution
when module loading is enabled. A local attacker could exploit this flaw =
to
cause a leak of kernel stack contents. (CVE-2012-4530)

Florian Weimer discovered that hypervkvpd, which is distributed in the
Linux kernel, was not correctly validating source addresses of netlink
packets. An untrusted local user can cause a denial of service by causing=

hypervkvpd to exit. (CVE-2012-5532)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-36-generic 3.2.0-36.57
linux-image-3.2.0-36-generic-pae 3.2.0-36.57
linux-image-3.2.0-36-highbank 3.2.0-36.57
linux-image-3.2.0-36-omap 3.2.0-36.57
linux-image-3.2.0-36-powerpc-smp 3.2.0-36.57
linux-image-3.2.0-36-powerpc64-smp 3.2.0-36.57
linux-image-3.2.0-36-virtual 3.2.0-36.57

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-1696-1
CVE-2012-4461, CVE-2012-4530, CVE-2012-5532

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-36.57


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