Issued at: 2026-09-19
Updated at: 2026-09-19
Advisory content derived from Red Hat RHSA-2026:68531, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: kernel security update
Description
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.