Mageia: MGASA-2021-0538 Critical: Kernel Use-After-Free and Race Condition

This kernel update is based on upstream 5.15.6 and fixes atleast the following security issues:
A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver) (CVE-2020-27820).
A race condition when the eBPF map is frozen (CVE-2021-4001).
A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data (CVE-2021-4002).
In addition to the upstream changes, we also have added the following fixes: - ata: ahci: Add Green Sardine vendor ID as board_ahci_mobile - cpufreq: intel_pstate: ITMT support for overclocked system - Revert "drm/i915: Implement Wa_1508744258" - drm/i915/adl-n: En...