Debian Bullseye DSA-5095-1 Critical: Kernel Issues Affecting Security

CVE-2020-36310

A flaw was discovered in the KVM implementation for AMD processors,
which could lead to an infinite loop. A malicious VM guest could
exploit this to cause a denial of service.

CVE-2022-0001 (INTEL-SA-00598)

Researchers at VUSec discovered that the Branch History Buffer in
Intel processors can be exploited to create information side-
channels with speculative execution. This issue is similar to
Spectre variant 2, but requires additional mitigations on some
processors.

This can be exploited to obtain sensitive information from a
different security context, such as from user-space to the kernel,
or from a KVM guest to the kernel.

CVE-2022-0002 (INTEL-SA-00598)

This is a similar issue to CVE-2022-0001, but covers exploitation
within a security context, such as from JIT-compiled code in a
sandbox to hosting code in the same process.

This is partly mitigated by disabling eBPF for unprivileged users with the sysctl: kernel.unpr...