Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-08T00:00:00 kernel: sched/mmcid: Prevent CID stalls due to concurrent forks 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-821

A flaw was found in the Linux kernel's `sched/mmcid` component. When new tasks are created concurrently, a race condition can occur where a task is accounted as a Memory Management Context ID (MMCID) user before it is fully registered in the system's task lists. This can lead to an incorrect allocation of Context IDentifiers (CIDs). As a result, the system may fail to acquire a necessary CID, causing the machine to stall and resulting in a Denial of Service (DoS).

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Out of support scope 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-2026-43418 https://nvd.nist.gov/vuln/detail/CVE-2026-43418 https://lore.kernel.org/linux-cve-announce/2026050846-CVE-2026-43418-8b7a@gregkh/T