CVE-2026-98586

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association. The timer handler then takes a reference on the already freed object and eventually drops it, causing a refcount underflow. Hold the object before mod_timer() and drop the reference if mod_timer() reports that the timer was already pending in timer handlers. Apply the same ordering to the proto-unreachable path, which can rearm a transport timer outside the timer handlers without holding the sock lock.

Gravité et risque d'exploitation

CVE-2026-98586 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 0.17 %, ce qui la place devant 6.2 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <cae23ae3f7887a1cf8a75da38edcebeef695040f, <=6.12.*, <27c51a9b55b227309161c903f9ecfbf022516bc2, 2.6.12, <d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f, <f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050, 6.18.55, 0, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 6.12.112, 6.6.158, <=6.6.*, <f9d929026d487a988bfa12c065f892e823e5b6ab, 6.1.189, <=6.18.*, 5.15.222, <35bf3b23c9a871f44c1453d85f8332be4e088dda, <=7.2.*, 7.2.9, <=*, <9d3d39da054476e7aa05cd877b93ca73a9a77434, <=5.15.*, 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.

Références

• https://git.kernel.org/stable/c/f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050
• https://git.kernel.org/stable/c/f9d929026d487a988bfa12c065f892e823e5b6ab
• https://git.kernel.org/stable/c/9d3d39da054476e7aa05cd877b93ca73a9a77434
• https://git.kernel.org/stable/c/27c51a9b55b227309161c903f9ecfbf022516bc2
• https://git.kernel.org/stable/c/d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f
• https://git.kernel.org/stable/c/35bf3b23c9a871f44c1453d85f8332be4e088dda
• https://git.kernel.org/stable/c/cae23ae3f7887a1cf8a75da38edcebeef695040f