Red Hat alert RHSA-2026:39983-01 (kernel-rt)

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2
Update Services for SAP Solutions.

Red Hat Product Security has rated this update as having a security impact of
Moderate. 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-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup
(CVE-2026-43027)

* kernel: rtmutex: Use waiter::task instead of current in remove_waiter()
(CVE-2026-43499)

* kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
(CVE-2026-46113)

* kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter()
on self-deadlock (CVE-2026-53166)

* kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role
(CVE-2026-53359)

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.

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Original: https://access.redhat.com/security/data/csaf/v2/advisories/2026/rhsa-2026_39983.json