RHSA-2026:26563 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858)

• kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366)

• kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724)

• kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800)

• kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089)

• kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116)

• kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984)

• kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990)

• kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)

• kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)

• kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116)

• kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)

• kernel: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163)

• kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)

• kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

• kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)

• kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227)

• kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.