CVE-2026-31756

Description

In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop() dwc2_gadget_exit_clock_gating() internally calls call_gadget() macro, which expects hsotg->lock to be held since it does spin_unlock/spin_lock around the gadget driver callback invocation. However, dwc2_hsotg_udc_stop() calls dwc2_gadget_exit_clock_gating() without holding the lock. This leads to: - spin_unlock on a lock that is not held (undefined behavior) - The lock remaining held after dwc2_gadget_exit_clock_gating() returns, causing a deadlock when spin_lock_irqsave() is called later in the same function. Fix this by acquiring hsotg->lock before calling dwc2_gadget_exit_clock_gating() and releasing it afterwards, which satisfies the locking requirement of the call_gadget() macro.

Gravité et risque d'exploitation

CVE-2026-31756 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 0.13 %, ce qui la place devant 2.0 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <6.12.81, <=6.1.*, <51b62286fc668c6eb74dee7624ec0beec3c5a0ed, <=6.12.*, <9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a, <beab10429439e20708036a66fb0d97ffb79da6a1, 0, 5.15.187, 6.6.134, 7.0, <5.15.203, <6.1.168, af076a41f8a28faf9ceb9dd2d88aef2c202ef39a, 41732f9febdccb4f9b87c13cb915d717d68ccafd, b39c203690fa1678daecc60f347e43c8b593b969, <=6.6.*, <=6.19.*, 5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd, <4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4, <e9fcca3e87463013d595c65c2189ffaa32ad3b50, <61937f686290494998236c680ce0836b8dd63a3f, 5.15.203, ba78c2b3254c4a458c01776612e8a573e12f8d26, 6.16, <6.6.134, <=6.18.*, <8ffe31acb3b77a30ae34d01719a269881569fb7f, 6.12.81, 6.15.5, 6.6.96, <6.16, <=*, <=5.15.*, 6.1.168, 6.12.36, 6.18.22, 6.19.12, 6.1.143, 1ac826cebc2776f91569f2aa9c9c3da2375d2096) 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/e9fcca3e87463013d595c65c2189ffaa32ad3b50
• https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f
• https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1
• https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4
• https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f
• https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed
• https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a