This kernel update is based on upstream 5.15.50 and fixes at least the following security issues:
Incomplete cleanup of multi-core shared buffers for some Intel Processors may allow an authenticated user to potentially enable information disclosure via local access (CVE-2022-21123).
Incomplete cleanup of microarchitectural fill buffers on some Intel Processors may allow an authenticated user to potentially enable information disclosure via local access (CVE-2022-21125).
Incomplete cleanup in specific special register read operations for some Intel Processors may allow an authenticated user to potentially enable information disclosure via local access (CVE-2022-21127, CVE-2022-21166).
For other upstream fixes, see the referenced changelogs.