CVE-2026-53370

Description

In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: Improve validation and configuration of ACR masks Currently there are several issues on the user space ACR mask validation and configuration. - The validation for user space ACR mask (attr.config2) is incomplete, e.g., the ACR mask could include the index which belongs to another ACR events group, but it's not validated. - An early return on an invalid ACR mask caused all subsequent ACR groups to be skipped. - The stale hardware ACR mask (hw.config1) is not cleared before setting new hardware ACR mask. The following changes address all of the above issues. - Figure out the event index group of an ACR group. Any bits in the user-space mask not present in the index group are now dropped. - Instead of an early return on invalid bits, drop only the invalid portions and continue iterating through all ACR events to ensure full configuration. - Explicitly clear the stale hardware ACR mask for each event prior to writing the new configuration. Besides, a non-leader event member of ACR group could be disabled in theory. This could cause bit-shifting errors in the acr_mask of remaining group members. But since ACR sampling requires all events to be active, this should not be a big concern in real use case. Add a "FIXME" comment to notice this risk.

Gravité et risque d'exploitation

CVE-2026-53370 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 0.16 %, ce qui la place devant 4.8 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <6.16, <=7.0.*, 7.0.7, <=*, 6.16, 7.1, ec980e4facef8110f6fce27e5b6344660117f01f, <aab56b95bee3ff79176b13443cd9d7cfe9747df0, <5ad732a56be46aabf158c16aa0c095291727aaef, <c05e01cef47d9b4969eae2dcf9467e2a555bcb4f, <=6.18.*, 0, 6.18.30) 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/aab56b95bee3ff79176b13443cd9d7cfe9747df0
• https://git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f
• https://git.kernel.org/stable/c/5ad732a56be46aabf158c16aa0c095291727aaef