USN-2750-1: Linux kernel (Utopic HWE) vulnerability

29 September 2015

linux-lts-utopic vulnerability

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

  • Ubuntu 14.04 LTS

Summary

The system could be made to crash or run programs as an administrator.

Software Description

  • linux-lts-utopic - Linux hardware enablement kernel from Utopic

Details

It was discovered that an integer overflow error existed in the SCSI generic (sg) driver in the Linux kernel. A local attacker with write permission to a SCSI generic device could use this to cause a denial of service (system crash) or potentially escalate their privileges.

Update instructions

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

Ubuntu 14.04 LTS
linux-image-3.16.0-50-generic - 3.16.0-50.66~14.04.1
linux-image-3.16.0-50-generic-lpae - 3.16.0-50.66~14.04.1
linux-image-3.16.0-50-lowlatency - 3.16.0-50.66~14.04.1
linux-image-3.16.0-50-powerpc-e500mc - 3.16.0-50.66~14.04.1
linux-image-3.16.0-50-powerpc-smp - 3.16.0-50.66~14.04.1
linux-image-3.16.0-50-powerpc64-emb - 3.16.0-50.66~14.04.1
linux-image-3.16.0-50-powerpc64-smp - 3.16.0-50.66~14.04.1

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