USN-2829-1: Linux kernel vulnerabilities

4 December 2015

linux vulnerabilities

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

  • Ubuntu 15.04

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

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)

Update instructions

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

Ubuntu 15.04
linux-image-3.19.0-39-generic - 3.19.0-39.44
linux-image-3.19.0-39-generic-lpae - 3.19.0-39.44
linux-image-3.19.0-39-lowlatency - 3.19.0-39.44
linux-image-3.19.0-39-powerpc-e500mc - 3.19.0-39.44
linux-image-3.19.0-39-powerpc-smp - 3.19.0-39.44
linux-image-3.19.0-39-powerpc64-emb - 3.19.0-39.44
linux-image-3.19.0-39-powerpc64-smp - 3.19.0-39.44

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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