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USN-2946-1: Linux kernel vulnerabilities

6 April 2016

Several security issues were fixed in the kernel.

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Releases

Packages

Details

Venkatesh Pottem discovered a use-after-free vulnerability in the Linux
kernel's CXGB3 driver. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)

Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux
Extended Verification Module (EVM). An attacker could use this to affect
system integrity. (CVE-2016-2085)

David Herrmann discovered that the Linux kernel incorrectly accounted file
descriptors to the original opener for in-flight file descriptors sent over
a unix domain socket. A local attacker could use this to cause a denial of
service (resource exhaustion). (CVE-2016-2550)

It was discovered that the Linux kernel did not enforce limits on the
amount of data allocated to buffer pipes. A local attacker could use this
to cause a denial of service (resource exhaustion). (CVE-2016-2847)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 14.04

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.

Related notices

  • USN-2947-3: linux-raspi2, linux-image-4.2.0-1028-raspi2
  • USN-2947-1: linux-image-4.2.0-35-generic-lpae, linux-image-4.2.0-35-powerpc-e500mc, linux, linux-image-4.2.0-35-powerpc64-emb, linux-image-4.2.0-35-powerpc64-smp, linux-image-4.2.0-35-generic, linux-image-4.2.0-35-powerpc-smp, linux-image-4.2.0-35-lowlatency
  • USN-2948-1: linux-image-3.16.0-69-lowlatency, linux-image-3.16.0-69-powerpc-smp, linux-image-3.16.0-69-generic, linux-image-3.16.0-69-powerpc-e500mc, linux-image-3.16.0-69-generic-lpae, linux-image-extra-3.16.0-69-generic, linux-lts-utopic, linux-image-3.16.0-69-powerpc64-emb, linux-image-3.16.0-69-powerpc64-smp
  • USN-2967-2: linux-ti-omap4, linux-image-3.2.0-1480-omap4
  • USN-2967-1: linux-image-3.2.0-102-powerpc64-smp, linux, linux-image-3.2.0-102-omap, linux-image-3.2.0-102-virtual, linux-image-3.2.0-102-generic-pae, linux-image-3.2.0-102-highbank, linux-image-3.2.0-102-generic, linux-image-3.2.0-102-powerpc-smp
  • USN-2946-2: linux-lts-trusty, linux-image-3.13.0-85-generic-lpae, linux-image-3.13.0-85-generic
  • USN-2947-2: linux-image-4.2.0-35-generic-lpae, linux-image-4.2.0-35-powerpc-e500mc, linux-image-4.2.0-35-powerpc64-emb, linux-image-4.2.0-35-powerpc64-smp, linux-image-4.2.0-35-generic, linux-lts-wily, linux-image-extra-4.2.0-35-generic, linux-image-4.2.0-35-powerpc-smp, linux-image-4.2.0-35-lowlatency
  • USN-2949-1: linux-image-extra-3.19.0-58-generic, linux-image-3.19.0-58-lowlatency, linux-image-3.19.0-58-generic, linux-lts-vivid, linux-image-3.19.0-58-powerpc-smp, linux-image-3.19.0-58-powerpc64-emb, linux-image-3.19.0-58-powerpc-e500mc, linux-image-3.19.0-58-generic-lpae, linux-image-3.19.0-58-powerpc64-smp
  • USN-2965-2: linux-image-4.4.0-22-powerpc64-smp, linux-image-4.4.0-22-lowlatency, linux-image-4.4.0-22-powerpc-e500mc, linux-image-4.4.0-22-powerpc-smp, linux-image-4.4.0-22-generic, linux-image-extra-4.4.0-22-generic, linux-image-4.4.0-22-powerpc64-emb, linux-lts-xenial, linux-image-4.4.0-22-generic-lpae