USN-3146-1: Linux kernel vulnerabilities
30 November 2016
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Several security issues were fixed in the kernel.
- linux - Linux kernel
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)
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 - 126.96.36.199.54
- linux-image-generic-lpae - 188.8.131.52.54
- linux-image-lowlatency - 184.108.40.206.54
- linux-image-powerpc-e500mc - 220.127.116.11.54
- linux-image-powerpc-smp - 18.104.22.168.54
- linux-image-powerpc64-emb - 22.214.171.124.54
- linux-image-powerpc64-smp - 126.96.36.199.54
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.