========================================================================== Ubuntu Security Notice USN-3161-1 December 20, 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: 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) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-57-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 4.4.0.57.60 linux-image-generic-lpae 4.4.0.57.60 linux-image-lowlatency 4.4.0.57.60 linux-image-powerpc-e500mc 4.4.0.57.60 linux-image-powerpc-smp 4.4.0.57.60 linux-image-powerpc64-emb 4.4.0.57.60 linux-image-powerpc64-smp 4.4.0.57.60 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: http://www.ubuntu.com/usn/usn-3161-1 CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-9555 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78