RHSA-2026:26428 - Security Advisory

Topic

An update for kernel-rt 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.

Description

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• 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: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)
• kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)
• kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)
• 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: 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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64

Fixes

• BZ - 2461503 - CVE-2026-31669 kernel: mptcp: fix slab-use-after-free in __inet_lookup_established
• BZ - 2464092 - CVE-2026-31787 kernel: xen/privcmd: fix double free via VMA splitting
• BZ - 2464096 - CVE-2026-31786 kernel: Buffer overflow in drivers/xen/sys-hypervisor.c
• BZ - 2467014 - CVE-2026-43110 kernel: wifi: brcmfmac: validate bsscfg indices in IF events
• BZ - 2468124 - CVE-2026-43329 kernel: netfilter: flowtable: strictly check for maximum number of actions
• BZ - 2482181 - CVE-2026-46056 kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
• BZ - 2482563 - CVE-2026-46152 kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result
• BZ - 2482608 - CVE-2026-46125 kernel: wifi: mac80211: remove station if connection prep fails

CVEs

• CVE-2026-31669
• CVE-2026-31786
• CVE-2026-31787
• CVE-2026-43110
• CVE-2026-43329
• CVE-2026-46056
• CVE-2026-46125
• CVE-2026-46152

References

• https://access.redhat.com/security/updates/classification/#important