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[USN-1699-2] Linux kernel regression

Posted on 01 February 2013
Ubuntu Security

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Ubuntu Security Notice USN-1699-2
February 01, 2013

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

- Ubuntu 12.10

Summary:

USN-1699-1 introduced a regression in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

USN-1699-1 fixed vulnerabilities in the Linux kernel. Due to an unrelated=

regression inotify/fanotify stopped working after upgrading. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtu=
al
machine) subsystem's handling of the XSAVE CPU feature. On hosts without=
the
XSAVE CPU feature, using qemu userspace, an unprivileged local attacker =
could
exploit this flaw to crash the system. (CVE-2012-4461)
=20
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)
=20
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 causin=
g
hypervkvpd to exit. (CVE-2012-5532)

Update instructions:

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

Ubuntu 12.10:
linux-image-3.5.0-23-generic 3.5.0-23.35
linux-image-3.5.0-23-highbank 3.5.0-23.35
linux-image-3.5.0-23-omap 3.5.0-23.35
linux-image-3.5.0-23-powerpc-smp 3.5.0-23.35
linux-image-3.5.0-23-powerpc64-smp 3.5.0-23.35

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-1699-2
http://www.ubuntu.com/usn/usn-1699-1
https://launchpad.net/bugs/XXXXXX

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.5.0-23.35


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