Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP6 kernel was updated to fix various security issues The following security issues were fixed: - CVE-2025-39998: scsi: target: target_core_configfs: Add length check to avoid buffer overflow (bsc#1252073). - CVE-2026-23103: ipvlan: Make the addrs_lock be per port (bsc#1257773). - CVE-2026-23231: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() (bsc#1259188). - CVE-2026-23243: RDMA/umad: Reject negative data_len in ib_umad_write (bsc#1259797). - CVE-2026-23272: netfilter: nf_tables: unconditionally bump set->nelems before insertion (bsc#1260009). - CVE-2026-23274: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels (bsc#1260005). - CVE-2026-23278: netfilter: nf_tables: always walk all pending catchall elements (bsc#1259998). - CVE-2026-23293: net: vxlan: fix nd_tbl NULL dereference when IPv6 is disabled (bsc#1260486). - CVE-2026-23317: drm/vmwgfx: Return the correct value in vmw_translate_ptr functions (bsc#1260562). - CVE-2026-23381: net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled (bsc#1260471). - CVE-2026-23398: icmp: fix NULL pointer dereference in icmp_tag_validation() (bsc#1260730). - CVE-2026-23412: netfilter: bpf: defer hook memory release until rcu readers are done (bsc#1261412). - CVE-2026-23413: clsact: Fix use-after-free in init/destroy rollback asymmetry (bsc#1261498). - CVE-2026-31788: xen/privcmd: restrict usage in unprivileged domU (bsc#1259707). The following non security issues were fixed: - KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE (bsc#1259461). - KVM: x86/mmu: Retry fault before acquiring mmu_lock if mapping is changing (bsc#1253122). - net: mana: fix use-after-free in add_adev() error path (git-fixes). - net: mana: Trigger VF reset/recovery on health check failure due to HWC timeout (bsc#1259580). - x86/platform/uv: Handle deconfigured sockets (bsc#1260347). - xen/privcmd: unregister xenstore notifier on module exit (git-fixes).