USN-3548-1: Linux kernel vulnerability

26 January 2018

linux vulnerability

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

  • Ubuntu 17.10

Summary

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

Software Description

  • linux - Linux kernel

Details

Jay Vosburgh discovered a logic error in the x86-64 syscall entry implementation in the Linux kernel, introduced as part of the mitigations for the Spectre vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

Update instructions

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

Ubuntu 17.10
linux-image-4.13.0-32-generic - 4.13.0-32.35
linux-image-4.13.0-32-lowlatency - 4.13.0-32.35
linux-image-generic - 4.13.0.32.34
linux-image-lowlatency - 4.13.0.32.34

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. 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