USN-3147-1: Linux kernel vulnerabilities

30 November 2016

linux vulnerabilities

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

  • Ubuntu 16.10

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

Andreas Gruenbacher and Jan Kara discovered that the filesystem implementation in the Linux kernel did not clear the setgid bit during a setxattr call. A local attacker could use this to possibly elevate group privileges. (CVE-2016-7097)

Marco Grassi discovered that the driver for Areca RAID Controllers in the Linux kernel did not properly validate control messages. A local attacker could use this to cause a denial of service (system crash) or possibly gain privileges. (CVE-2016-7425)

Update instructions

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

Ubuntu 16.10
linux-image-4.8.0-28-generic - 4.8.0-28.30
linux-image-4.8.0-28-generic-lpae - 4.8.0-28.30
linux-image-4.8.0-28-lowlatency - 4.8.0-28.30
linux-image-4.8.0-28-powerpc-e500mc - 4.8.0-28.30
linux-image-4.8.0-28-powerpc-smp - 4.8.0-28.30
linux-image-4.8.0-28-powerpc64-emb - 4.8.0-28.30
linux-image-generic - 4.8.0.28.37
linux-image-generic-lpae - 4.8.0.28.37
linux-image-lowlatency - 4.8.0.28.37
linux-image-powerpc-e500mc - 4.8.0.28.37
linux-image-powerpc-smp - 4.8.0.28.37
linux-image-powerpc64-emb - 4.8.0.28.37

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