Mageia 8 MGASA-2023-0243 Severe: Kernel Access Rights Threat

This kernel-linus update is based on upstream 5.15.122 and fixes atleast the following security issues:
Under specific microarchitectural circumstances, a register in "Zen 2" CPUs may not be written to 0 correctly. This may cause data from another process and/or thread to be stored in the YMM register, which may allow an attacker to potentially access sensitive information (CVE-2023-20593, also known as Zenbleed).
This update adds a kernel-side mitigation for this issue to protect users until Amd gets their fixed microcode / AGESA updates out for all affected CPUs. The fixed microcode for Amd EPYC gen2 is available in the microcode-0.20230613-2.mga8.nonfree package. For other affected CPUs, see the referenced amd.com url that has info about estimated microcode update timelines for various CPUs.
Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; nft_chain_lookup_byid() failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network n...