UBUNTU-CVE-2021-28971

In intelpmudrainpebsnhm in arch/x86/events/intel/ds.c in the Linux kernel through 5.11.8 on some Haswell CPUs, userspace applications such as perf-fuzzer can cause a system crash because the PEBS status in a PEBS record is mishandled, aka CID-d88d05a9e0b6...