CVE-2026-72483

Description

In the Linux kernel, the following vulnerability has been resolved: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control() The `max3421_hub_control()` function handles USB hub class requests to the virtual root hub. In the `default` branches of both the `ClearPortFeature` and `SetPortFeature` switch statements, it modifies `max3421_hcd->port_status` by left shifting 1 by the request's `value` parameter. However, it does not validate whether this shift will exceed the width of `port_status`. So if a malicious userspace task with access to the root hub via /dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue` greater than or equal to 32, the left shift operation invokes shift-out-of-bounds undefined behavior. This results in arbitrary bit corruption of `port_status`, including the normally-immutable change bits, which can bypass internal state checks and confuse the hub status. Fix this by rejecting requests whose `value` exceeds the shift width before performing the shift. This issue was found using a KLEE-based symbolic execution tool for kernel drivers that I'm currently developing.

Gravité et risque d'exploitation

CVE-2026-72483 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.19 %, ce qui la place devant 8.6 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, 7.2, <e5fa9d8f40746ec3447335c9642c03410f5fd3af, 2d53139f31626bad6f8983d8e519ddde2cbba921, 0, <=7.1.*, <08b1d4cab0230697bc74c63fc4e40170a7559c54, 6.1.178, <00dd025324b56d39d37e57a08f473dab3a660f30, <02d03c61e8a7b016956acb48e8a2512d16d87517, <4da073d57176d8e1c2bca34febfbc81d2560c1a5, <=5.10.*, <=6.6.*, 6.12.97, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, <3be5f24e8270ba53b3c814d13689bb8644c86237, <d512bdefd241b98f4d7bcb5bab5614a86411fad4, <=*, <=5.15.*, 3.16, <3.16, <cff06b03b530ae1fe8a13e93a7848f2130e00fb4) 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/e5fa9d8f40746ec3447335c9642c03410f5fd3af
• https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54
• https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237
• https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4
• https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30
• https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517
• https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5
• https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4