========================================================================== Ubuntu Security Notice USN-3170-1 January 11, 2017 linux vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.10 Summary: Several security issues were fixed in the kernel. Software Description: - linux: Linux kernel Details: Dmitry Vyukov discovered that the KVM implementation in the Linux kernel did not properly initialize the Code Segment (CS) in certain error cases. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2016-9756) Andrey Konovalov discovered that signed integer overflows existed in the setsockopt() system call when handling the SO_SNDBUFFORCE and SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability could use this to cause a denial of service (system crash or memory corruption). (CVE-2016-9793) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.10: linux-image-4.8.0-34-generic 4.8.0-34.36 linux-image-4.8.0-34-generic-lpae 4.8.0-34.36 linux-image-4.8.0-34-lowlatency 4.8.0-34.36 linux-image-4.8.0-34-powerpc-e500mc 4.8.0-34.36 linux-image-4.8.0-34-powerpc-smp 4.8.0-34.36 linux-image-4.8.0-34-powerpc64-emb 4.8.0-34.36 linux-image-generic 4.8.0.34.43 linux-image-generic-lpae 4.8.0.34.43 linux-image-lowlatency 4.8.0.34.43 linux-image-powerpc-e500mc 4.8.0.34.43 linux-image-powerpc-smp 4.8.0.34.43 linux-image-powerpc64-emb 4.8.0.34.43 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-3170-1 CVE-2016-9756, CVE-2016-9793 Package Information: https://launchpad.net/ubuntu/+source/linux/4.8.0-34.36