RHSA-2026:68531 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 8.

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: ipvlan: Make the addrs_lock be per port (CVE-2026-23103)

• kernel: xfrm: hold dev ref until after transport_finish NF_HOOK (CVE-2026-31663)

• kernel: netfilter: nf_conntrack_h323: fix OOB read in decode_choice() (CVE-2026-43233)

• kernel: ipv6: prevent possible UaF in addrconf_permanent_addr() (CVE-2026-43339)

• kernel: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP (CVE-2026-46266)

• kernel: flow_dissector: do not dissect PPPoE PFC frames (CVE-2026-46306)

• kernel: netfilter: xt_policy: fix strict mode inbound policy matching (CVE-2026-52920)

• kernel: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls (CVE-2026-53075)

• kernel: ipv6: sit: reload inner IPv6 header after GSO offloads (CVE-2026-53228)

• kernel: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN (CVE-2026-53176)

• kernel: netfilter: require Ethernet MAC header before using eth_hdr() (CVE-2026-53131)

• kernel: netfilter: conntrack_irc: fix possible out-of-bounds read (CVE-2026-53268)

• kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() (CVE-2026-53239)

• kernel: ALSA: timer: Fix UAF at snd_timer_user_params() (CVE-2026-53192)

• kernel: net: guard timestamp cmsgs to real error queue skbs (CVE-2026-53223)

• kernel: ipv6: mcast: Fix use-after-free when processing MLD queries (CVE-2026-53275)

• kernel: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)

• kernel: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate() (CVE-2026-63921)

• kernel: xfrm: input: hold netns during deferred transport reinjection (CVE-2026-63919)

• kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink() (CVE-2026-63917)

• kernel: Linux kernel SLIP: Out-of-bounds write due to race condition during MTU change (CVE-2026-68143)

• kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment (CVE-2026-68426)

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.