CVE-2026-98463
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Derive SCX_RQ_IN_WAKEUP from the core enqueue flags schedule_deferred_locked() skips scheduling a deferred action while SCX_RQ_IN_WAKEUP is set and relies on the task_woken_scx() call that follows a wakeup enqueue to run it. enqueue_task_scx() sets the flag from the merged enqueue flags, which include the flags stashed for a remote activation. move_remote_task_to_local_dsq() thus sets SCX_RQ_IN_WAKEUP on the destination rq when the moved task was woken up, although no task_woken_scx() follows that activation. An IMMED insert into a busy destination requests a local reenqueue during that enqueue. The request gets linked but not scheduled and stays pending until an unrelated wakeup or preemption on that CPU runs the deferred actions. The IMMED task sits behind the running task in the meantime. If nothing runs them before the scheduler is disabled, the request outlives the scheduler and points into its freed per-cpu area, which the next scheduler dereferences from run_deferred(). Test the core enqueue flags for the wakeup bit. Only the core's wakeup path is followed by task_woken_scx().
Gravité et risque d'exploitation
CVE-2026-98463 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.20 %, ce qui la place devant 9.0 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions 6.18.55, 0, 7.0, ee502c056c4c9cce4c132ccb588e06ffe5b831c1, <6c401ae426e20e53a3398a8e79afd0964c0f5110, <6.18.55, 6.18.19, <7.0, 997967adf10ce26c3e7bd89598b3ded62b943052, <6.20, 6.19.9, <=6.18.*, <=7.2.*, <3fdf2ceb31e8aff77451e468bc8409e10587916a, 57ccf5ccdc56954f2a91a7f66684fd31c566bde5, 7.2.9, <=*, <df5cdc2c832ca4e8a6d774596b9005558761a403, 7.3) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.