1. Ubuntu Security Notices
  2. USN-3147-1

USN-3147-1: Linux kernel vulnerabilities

Publication date

30 November 2016

Overview

Several security issues were fixed in the kernel.

Releases

Packages

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)

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

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. 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.

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

Ubuntu Release Package Version
16.10 yakkety linux-image-powerpc-smp –  4.8.0.28.37
linux-image-powerpc-e500mc –  4.8.0.28.37
linux-image-generic –  4.8.0.28.37
linux-image-4.8.0-28-lowlatency –  4.8.0-28.30
linux-image-lowlatency –  4.8.0.28.37
linux-image-4.8.0-28-generic –  4.8.0-28.30
linux-image-4.8.0-28-powerpc-e500mc –  4.8.0-28.30
linux-image-4.8.0-28-powerpc64-emb –  4.8.0-28.30
linux-image-generic-lpae –  4.8.0.28.37
linux-image-4.8.0-28-powerpc-smp –  4.8.0-28.30
linux-image-powerpc64-emb –  4.8.0.28.37
linux-image-4.8.0-28-generic-lpae –  4.8.0-28.30

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References

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