A flaw was found in the Linux kernel, specifically within the `sched_ext` component. This vulnerability can lead to a system-wide deadlock, causing a Denial of Service (DoS) where the system becomes unresponsive. The issue arises when the kernel's scheduling mechanism enters a busy-wait state in a critical section, preventing processors from performing other tasks. If multiple processors become stuck in this waiting loop, the entire system can freeze.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-43326 https://nvd.nist.gov/vuln/detail/CVE-2026-43326 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43326.mbox