Red Hat Security Advisory: kernel security, bug fix, and enhancement update

CVE-2023-53372 — kernel: sctp: fix a potential overflow in sctp_ifwdtsn_skip CVE-2025-21858 — kernel: geneve: Fix use-after-free in geneve_find_dev(). CVE-2025-40135 — kernel: ipv6: use RCU in ip6_xmit() CVE-2025-40158 — kernel: ipv6: use RCU in ip6_output() CVE-2025-40170 — kernel: net: use dst_dev_rcu() in sk_setup_caps() CVE-2025-68366 — kernel: nbd: defer config unlock in nbd_genl_connect CVE-2025-68800 — kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats CVE-2025-71089 — kernel: iommu: disable SVA when CONFIG_X86 is set CVE-2026-23001 — kernel: macvlan: fix possible UAF in macvlan_forward_source() CVE-2026-23097 — kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration CVE-2026-23191 — kernel: ALSA: aloop: Fix racy access at PCM trigger CVE-2026-23216 — kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() CVE-2026-23243 — kernel: Linux kernel: Denial of service and memory corruption in RDMA umad CVE-2026-23392 — kernel: netfilter: nf_tables: release flowtable after rcu grace period on error CVE-2026-31685 — kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets CVE-2026-43037 — kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() CVE-2026-43038 — kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() CVE-2026-43110 — kernel: wifi: brcmfmac: validate bsscfg indices in IF events CVE-2026-43116 — kernel: netfilter: ctnetlink: ensure safe access to master conntrack CVE-2026-43158 — kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks CVE-2026-43163 — kernel: md/bitmap: fix GPF in write_page caused by resize race CVE-2026-43190 — kernel: netfilter: xt_tcpmss: check remaining length before reading optlen CVE-2026-46227 — kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL CVE-2026-46243 — kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions