This Red Hat security advisory (RHSA-2026:40082) addresses five kernel vulnerabilities affecting Red Hat Enterprise Linux 9.2. The issues include: 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 bugs), and CVE-2026-53166 (futex/requeue NULL pointer dereference on self-deadlock). These vulnerabilities relate to kernel memory management and synchronization, potentially leading to system instability or privilege escalation. The advisory provides updated kernel packages to fix these defects and requires a system reboot for the update to take effect.

The vulnerabilities fixed in this advisory affect the Linux kernel's core components, including netfilter, real-time mutexes, KVM virtualization, and futex mechanisms. Exploitation could lead to use-after-free conditions, NULL pointer dereferences, and improper cleanup, which may cause system crashes, denial of service, or privilege escalation. The vendor rates the security impact as Important, indicating a high severity level. No known exploits in the wild have been reported at this time.

Red Hat has released updated kernel packages for Red Hat Enterprise Linux 9.2 that address these vulnerabilities. Users should apply the available kernel update as soon as possible and reboot their systems to ensure the fixes take effect. Refer to the official Red Hat advisory (RHSA-2026:40082) and article https://access.redhat.com/articles/11258 for detailed update instructions. No additional mitigations are specified beyond applying the official patch and rebooting.