The Red Hat kernel-rt security advisory (RHSA-2026:39983) addresses five vulnerabilities in the Real Time Linux Kernel used in Red Hat Enterprise Linux 9.2. The fixes cover: CVE-2026-43027 (netfilter nf_conntrack_helper cleanup), CVE-2026-43499 (rtmutex waiter task usage), CVE-2026-46113 and CVE-2026-53359 (KVM x86 shadow paging use-after-free issues), and CVE-2026-53166 (futex/requeue NULL pointer dereference). These vulnerabilities relate to kernel memory management and synchronization primitives, potentially leading to system instability or security issues. The advisory provides updated kernel-rt packages and requires rebooting the system for the patches to take effect.

The vulnerabilities affect kernel components responsible for network connection tracking, real-time mutex handling, KVM virtualization shadow paging, and futex requeue operations. Exploitation could lead to use-after-free conditions or NULL pointer dereferences, which may cause system crashes or privilege escalation. The overall security impact is rated moderate by Red Hat, indicating a significant but not critical risk.

Red Hat has released updated kernel-rt packages that address these vulnerabilities. Users should apply the provided security update for Red Hat Enterprise Linux 9.2 Real Time kernels and reboot affected systems to ensure the fixes take effect. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official update and rebooting.