CVE-2026-31728

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <e1eabb072c75681f78312c484ccfffb7430f206e, <bbb09bb89ffa571475f66daca9482b974cd29d6a, 0, <6ad77458637b78ec655e3da5f112c862e6690a9d, 6.6.134, 7.0, <2.6.27, <=5.10.*, <e1e7a66584bf0aff3becb73c19fa31527889fc9e, <=6.6.*, <=6.19.*, <8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8, 6.1.169, 5.15.203, <=6.18.*, 2b3d942c4878084a37991a65e66512c02b8fa2ad, 6.12.81, <=*, 5.10.253, <=5.15.*, <f02980594deef751e42133714aee25228f1494c6, <f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca, 2.6.27, 6.18.22, 6.19.12, <a259ba0bce3b192c04334499690372a250f7d0b1

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop A race condition between gether_disconnect() and eth_stop() leads to a NULL pointer dereference. Specifically, if eth_stop() is triggered concurrently while gether_disconnect() is tearing down the endpoints, eth_stop() attempts to access the cleared endpoint descriptor, causing the following NPE: Unable to handle kernel NULL pointer dereference Call trace: __dwc3_gadget_ep_enable+0x60/0x788 dwc3_gadget_ep_enable+0x70/0xe4 usb_ep_enable+0x60/0x15c eth_stop+0xb8/0x108 Because eth_stop() crashes while holding the dev->lock, the thread running gether_disconnect() fails to acquire the same lock and spins forever, resulting in a hardlockup: Core - Debugging Information for Hardlockup core(7) Call trace: queued_spin_lock_slowpath+0x94/0x488 _raw_spin_lock+0x64/0x6c gether_disconnect+0x19c/0x1e8 ncm_set_alt+0x68/0x1a0 composite_setup+0x6a0/0xc50 The root cause is that the clearing of dev->port_usb in gether_disconnect() is delayed until the end of the function. Move the clearing of dev->port_usb to the very beginning of gether_disconnect() while holding dev->lock. This cuts off the link immediately, ensuring eth_stop() will see dev->port_usb as NULL and safely bail out.

Gravité et risque d'exploitation

CVE-2026-31728 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 0.11 %, ce qui la place devant 1.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <e1eabb072c75681f78312c484ccfffb7430f206e, <bbb09bb89ffa571475f66daca9482b974cd29d6a, 0, <6ad77458637b78ec655e3da5f112c862e6690a9d, 6.6.134, 7.0, <2.6.27, <=5.10.*, <e1e7a66584bf0aff3becb73c19fa31527889fc9e, <=6.6.*, <=6.19.*, <8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8, 6.1.169, 5.15.203, <=6.18.*, 2b3d942c4878084a37991a65e66512c02b8fa2ad, 6.12.81, <=*, 5.10.253, <=5.15.*, <f02980594deef751e42133714aee25228f1494c6, <f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca, 2.6.27, 6.18.22, 6.19.12, <a259ba0bce3b192c04334499690372a250f7d0b1) 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