USN-3161-1: Linux kernel vulnerabilities
20 December 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
Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2015-8964)
It was discovered that the Video For Linux Two (v4l2) implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC_DQBUF ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-4568)
CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel’s mount table. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-6213)
It was discovered that the KVM implementation for x86/x86_64 in the Linux kernel could dereference a null pointer. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the KVM host. (CVE-2016-8630)
Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation in the Linux kernel contained a buffer overflow when handling fragmented packets. A remote attacker could use this to possibly execute arbitrary code with administrative privileges. (CVE-2016-8633)
Marco Grassi discovered that the TCP implementation in the Linux kernel mishandles socket buffer (skb) truncation. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-8645)
Andrey Konovalov discovered that the SCTP implementation in the Linux kernel improperly handled validation of incoming data. A remote attacker could use this to cause a denial of service (system crash). (CVE-2016-9555)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 16.04 LTS
- linux-image-4.4.0-57-generic - 4.4.0-57.78
- linux-image-4.4.0-57-generic-lpae - 4.4.0-57.78
- linux-image-4.4.0-57-lowlatency - 4.4.0-57.78
- linux-image-4.4.0-57-powerpc-e500mc - 4.4.0-57.78
- linux-image-4.4.0-57-powerpc-smp - 4.4.0-57.78
- linux-image-4.4.0-57-powerpc64-emb - 4.4.0-57.78
- linux-image-4.4.0-57-powerpc64-smp - 4.4.0-57.78
- linux-image-generic - 126.96.36.199.60
- linux-image-generic-lpae - 188.8.131.52.60
- linux-image-lowlatency - 184.108.40.206.60
- linux-image-powerpc-e500mc - 220.127.116.11.60
- linux-image-powerpc-smp - 18.104.22.168.60
- linux-image-powerpc64-emb - 22.214.171.124.60
- linux-image-powerpc64-smp - 126.96.36.199.60
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.