Vulnerabilidad · Publicado 19/08/2026
Una vulnerabilidad de race condition en el kernel permite que knotes con filtros basados en timer se colen en la lista activa de kqueue durante operaciones de fork, corrompiendo estructuras de memoria altas. Con CVSS 8.4, afecta la estabilidad y seguridad de servidores Unix/BSD en entornos empresariales de LATAM. La falta de sincronización de locks durante la copia de knotes habilita explotación local con privilegios elevados.
While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued on the kqueue's active list before the copy was complete. The copy routine did not account for this and could enqueue the new knote a second time, corrupting the active list. In addition, the copy routine did not hold the appropriate locks while reading knote state, allowing further races. An unprivileged local user can trigger a use-after-free in the kernel, potentially leading to privilege escalation.
Score: 8.4/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-416
Publicado en NIST NVD.