USN-3880-1: Linux kernel vulnerabilities
4 February 2019
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Several security issues were fixed in the Linux kernel.
- linux - Linux kernel
It was discovered that the CIFS client implementation in the Linux kernel did not properly handle setup negotiation during session recovery, leading to a NULL pointer exception. An attacker could use this to create a malicious CIFS server that caused a denial of service (client system crash). (CVE-2018-1066)
Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to expose sensitive information. (CVE-2018-17972)
Jann Horn discovered that the mremap() system call in the Linux kernel did not properly flush the TLB when completing, potentially leaving access to a physical page after it has been released to the page allocator. A local attacker could use this to cause a denial of service (system crash), expose sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)
It was discovered that the socket implementation in the Linux kernel contained a type confusion error that could lead to memory corruption. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-9568)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 14.04 LTS
- linux-image-3.13.0-165-generic - 3.13.0-165.215
- linux-image-3.13.0-165-generic-lpae - 3.13.0-165.215
- linux-image-3.13.0-165-lowlatency - 3.13.0-165.215
- linux-image-3.13.0-165-powerpc-e500 - 3.13.0-165.215
- linux-image-3.13.0-165-powerpc-e500mc - 3.13.0-165.215
- linux-image-3.13.0-165-powerpc-smp - 3.13.0-165.215
- linux-image-3.13.0-165-powerpc64-emb - 3.13.0-165.215
- linux-image-3.13.0-165-powerpc64-smp - 3.13.0-165.215
- linux-image-generic - 22.214.171.124.175
- linux-image-generic-lpae - 126.96.36.199.175
- linux-image-lowlatency - 188.8.131.52.175
- linux-image-powerpc-e500 - 184.108.40.206.175
- linux-image-powerpc-e500mc - 220.127.116.11.175
- linux-image-powerpc-smp - 18.104.22.168.175
- linux-image-powerpc64-emb - 22.214.171.124.175
- linux-image-powerpc64-smp - 126.96.36.199.175
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.