RHSA-2026:27789 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 9.

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: can: isotp: fix tx.buf use-after-free in isotp_sendmsg() (CVE-2026-31474)

• kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)

• kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)

• kernel: Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync (CVE-2026-31772)

• kernel: bnxt_en: Fix RSS context delete logic (CVE-2026-43260)

• kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing (CVE-2026-43279)

• kernel: scsi: qla2xxx: Completely fix fcport double free (CVE-2026-43414)

• kernel: net/sched: act_pedit: extend the writable skb range per key (CVE-2026-46331)

• kernel: gfs2: Fix use-after-free in iomap inline data write path (CVE-2026-45984)

• kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers (CVE-2026-46056)

• kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result (CVE-2026-46152)

• kernel: RDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss() (CVE-2026-46117)

• kernel: RDMA/mana: Validate rx_hash_key_len (CVE-2026-46145)

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

• kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)

• kernel: wifi: mac80211: use safe list iteration in radar detect work (CVE-2026-46166)

• kernel: nvmet-tcp: fix race between ICReq handling and queue teardown (CVE-2026-46135)

Bug Fix(es) and Enhancement(s):

• RHEL9.4 - s390/ap: Expose ap_bindings_complete_count counter via sysfs [rhel-9.8.z] (JIRA:RHEL-166048)

• [RHEL 9.8] Hung tasks during both suspend and hibernate operations on systems with Intel E810 NICs [rhel-9.8.z] (JIRA:RHEL-175699)

• DPLL: Add support for pin operational state [rhel-9.8.z] (JIRA:RHEL-175820)

• DPLL: Add support for fractional frequency offset between pin and device [rhel-9.8.z] (JIRA:RHEL-175823)

• ibmveth Adapter Freeze with Small MSS [rhel-9.8.z] (JIRA:RHEL-178308)

• RHEL9.4 - s390/mm: Add missing secure storage access fixups [rhel-9.8.z] (JIRA:RHEL-183317)

• rbd: eliminate a race in lock_dwork draining on unmap [rhel-9.8.z] (JIRA:RHEL-183130)

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.