Security update for the Linux Kernel RT (Live Patch 0 for SLE 15 SP5)

This update for the Linux Kernel 5.14.21-150500_11 fixes several issues. The following security issues were fixed: - CVE-2023-4147: Fixed use-after-free in nf_tables_newrule (bsc#1215118). - CVE-2023-4623: Fixed a use-after-free issue in the HFSC network scheduler which could be exploited to achieve local privilege escalation (bsc#1215440). - CVE-2023-4004: Fixed improper element removal netfilter nft_set_pipapo (bsc#1214812). - CVE-2023-3390: Fixed an use-after-free vulnerability in the netfilter subsystem in net/netfilter/nf_tables_api.c that could allow a local attacker with user access to cause a privilege escalation issue (bsc#1212934).