Ubuntu Security Notice 2516-3 - USN-2516-1 fixed vulnerabilities in the Linux kernel, and the fix in USN-2516-2 was incomplete. There was an unrelated regression in the use of the virtual counter (CNTVCT) on arm64 architectures. This update fixes the problem. Various other issues were also addressed.
1a88ef9adcc3ea7c2604f0479fa1730a550192db416be0a49b7d6ed0f176098a