Issued at: 2026-09-11
Updated at: 2026-09-12
Advisory content derived from Red Hat RHSA-2026:66180, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: kernel security, bug fix, and enhancement update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation (CVE-2026-43133)
* kernel: ipv6: prevent possible UaF in addrconf_permanent_addr() (CVE-2026-43339)
* kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests (CVE-2026-43493)
* kernel: tcp: call sk_data_ready() after listener migration (CVE-2026-46015)
* kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() (CVE-2026-46149)
* 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: Revert "net/smc: Introduce TCP ULP support" (CVE-2026-46330)
* kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)
* 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: account for fraggap on the paged allocation path (CVE-2026-53366)
* kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034)
* kernel: rhashtable: clear stale iter->p on table restart (CVE-2026-64563)
* kernel: smb: client: fix double-free in SMB2_close() replay (CVE-2026-64597)
* kernel: nvmet-rdma: handle inline data with a nonzero offset (CVE-2026-72129)
* kernel: net: bridge: stop fast-leave after deleting a port group (CVE-2026-74480)
Bug Fix(es) and Enhancement(s):
* KSM to deduplicate only zero pages [rhel-9.8.z] (JIRA:Rocky Linux-249161)
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.