[USN-5039-1] Linux kernel vulnerability

========================================================================== Ubuntu Security Notice USN-5039-1 August 12, 2021
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM – Ubuntu 14.04 ESM
The system could be made to crash or run programs as an administrator.
Software Description: – linux: Linux kernel – linux-aws: Linux kernel for Amazon Web Services (AWS) systems – linux-kvm: Linux kernel for cloud environments – linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
Andy Nguyen discovered that the netfilter subsystem in the Linux kernel contained an out-of-bounds write in its setsockopt() implementation. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 ESM: linux-image-4.4.0-1096-kvm 4.4.0-1096.105 linux-image-4.4.0-1131-aws 4.4.0-1131.145 linux-image-4.4.0-213-generic 4.4.0-213.245 linux-image-4.4.0-213-lowlatency 4.4.0-213.245 linux-image-aws linux-image-generic linux-image-kvm linux-image-lowlatency linux-image-virtual
Ubuntu 14.04 ESM: linux-image-3.13.0-187-generic 3.13.0-187.238 linux-image-3.13.0-187-generic-lpae 3.13.0-187.238 linux-image-3.13.0-187-lowlatency 3.13.0-187.238 linux-image-4.4.0-1095-aws 4.4.0-1095.100 linux-image-4.4.0-213-generic 4.4.0-213.245~14.04.1 linux-image-4.4.0-213-lowlatency 4.4.0-213.245~14.04.1 linux-image-aws linux-image-generic linux-image-generic-lpae linux-image-generic-lts-xenial linux-image-lowlatency linux-image-lowlatency-lts-xenial linux-image-server linux-image-virtual linux-image-virtual-lts-xenial
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: ubuntu.com/security/notices/USN-5039-1 CVE-2021-22555