1. Ubuntu Security Notices
  2. USN-2823-1

USN-2823-1: Linux kernel vulnerabilities

Publication date

1 December 2015

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

It was discovered that the SCTP protocol implementation in the Linux kernel
performed an incorrect sequence of protocol-initialization steps. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2015-5283)

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).
(CVE-2015-7872)

It was discovered that the SCTP protocol implementation in the Linux kernel
performed an incorrect sequence of protocol-initialization steps. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2015-5283)

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).
(CVE-2015-7872)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
14.04 trusty linux-image-3.13.0-71-generic –  3.13.0-71.114
linux-image-3.13.0-71-generic-lpae –  3.13.0-71.114
linux-image-3.13.0-71-lowlatency –  3.13.0-71.114
linux-image-3.13.0-71-powerpc-e500 –  3.13.0-71.114
linux-image-3.13.0-71-powerpc-e500mc –  3.13.0-71.114
linux-image-3.13.0-71-powerpc-smp –  3.13.0-71.114
linux-image-3.13.0-71-powerpc64-emb –  3.13.0-71.114
linux-image-3.13.0-71-powerpc64-smp –  3.13.0-71.114

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.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›