USN-3082-1: Linux kernel vulnerability

Releases

• Ubuntu 12.04

Packages

• linux - Linux kernel

Details

Chiachih Wu, Yuan-Tsung Lo, and Xuxian Jiang discovered that the legacy ABI
for ARM (OABI) had incomplete access checks for epoll_wait(2) and
semtimedop(2). A local attacker could use this to possibly execute
arbitrary code.

Update instructions

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

Ubuntu 12.04

• linux-image-3.2.0-110-generic - 3.2.0-110.151
• linux-image-3.2.0-110-omap - 3.2.0-110.151
• linux-image-3.2.0-110-powerpc-smp - 3.2.0-110.151
• linux-image-3.2.0-110-highbank - 3.2.0-110.151
• linux-image-3.2.0-110-powerpc64-smp - 3.2.0-110.151
• linux-image-3.2.0-110-virtual - 3.2.0-110.151
• linux-image-3.2.0-110-generic-pae - 3.2.0-110.151

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• CVE-2016-3857

Related notices

• USN-3082-2: linux-ti-omap4, linux-image-3.2.0-1488-omap4