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Ubuntu Security Notice USN-2840-2

Ubuntu Security Notice USN-2840-2
Posted Dec 17, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2840-2 - Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted to garbage collect incompletely instantiated keys. A local unprivileged attacker could use this to cause a denial of service (system crash).

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-7872
SHA-256 | 24c157bc5fb11507b05110e988d7bc8ac2a3a57436e0dee3534be4d8df1784a6

Ubuntu Security Notice USN-2840-2

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==========================================================================Ubuntu Security Notice USN-2840-2
December 17, 2015

linux-ti-omap4 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

The system could be made to crash under certain conditions.

Software Description:
- linux-ti-omap4: Linux kernel for OMAP4

Details:

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted
to garbage collect incompletely instantiated keys. A local unprivileged
attacker could use this to cause a denial of service (system crash).

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-1475-omap4 3.2.0-1475.97

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:
http://www.ubuntu.com/usn/usn-2840-2
http://www.ubuntu.com/usn/usn-2840-1
CVE-2015-7872

Package Information:
https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1475.97
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