Security update for the Linux Kernel (Live Patch 49 for SLE 15 SP3)

This update for the Linux Kernel 5.3.18-150300_59_179 fixes several issues. The following security issues were fixed: - CVE-2025-21999: proc: fix UAF in proc_get_inode() (bsc#1242579). - CVE-2022-49053: scsi: target: tcmu: Fix possible page UAF (bsc#1237930). - CVE-2025-38001: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (bsc#1244235). - CVE-2024-49867: btrfs: wait for fixup workers before stopping cleaner kthread during umount (bsc#1232271). - CVE-2025-38000: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (bsc#1245775). - CVE-2025-37890: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (bsc#1245791). - CVE-2024-47674: mm: avoid leaving partial pfn mappings around in error case (bsc#1231676). - CVE-2024-47706: block, bfq: fix possible UAF for bfqq->bic with merge chain (bsc#1231943). - CVE-2025-38212: ipc: fix to protect IPCS lookups using RCU (bsc#1246030).