USN-3146-1: Linux kernel vulnerabilities

30 November 2016

linux vulnerabilities

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

  • Ubuntu 16.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

It was discovered that the __get_user_asm_ex implementation in the Linux kernel for x86/x86_64 contained extended asm statements that were incompatible with the exception table. A local attacker could use this to gain administrative privileges. (CVE-2016-9644)

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)

Daxing Guo discovered a stack-based buffer overflow in the Broadcom IEEE802.11n FullMAC driver in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain privileges. (CVE-2016-8658)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-51-generic - 4.4.0-51.72
linux-image-4.4.0-51-generic-lpae - 4.4.0-51.72
linux-image-4.4.0-51-lowlatency - 4.4.0-51.72
linux-image-4.4.0-51-powerpc-e500mc - 4.4.0-51.72
linux-image-4.4.0-51-powerpc-smp - 4.4.0-51.72
linux-image-4.4.0-51-powerpc64-emb - 4.4.0-51.72
linux-image-4.4.0-51-powerpc64-smp - 4.4.0-51.72
linux-image-generic - 4.4.0.51.54
linux-image-generic-lpae - 4.4.0.51.54
linux-image-lowlatency - 4.4.0.51.54
linux-image-powerpc-e500mc - 4.4.0.51.54
linux-image-powerpc-smp - 4.4.0.51.54
linux-image-powerpc64-emb - 4.4.0.51.54
linux-image-powerpc64-smp - 4.4.0.51.54

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