CVE-2024-26933

Description

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix deadlock in port "disable" sysfs attribute The show and store callback routines for the "disable" sysfs attribute file in port.c acquire the device lock for the port's parent hub device. This can cause problems if another process has locked the hub to remove it or change its configuration: Removing the hub or changing its configuration requires the hub interface to be removed, which requires the port device to be removed, and device_del() waits until all outstanding sysfs attribute callbacks for the ports have returned. The lock can't be released until then. But the disable_show() or disable_store() routine can't return until after it has acquired the lock. The resulting deadlock can be avoided by calling sysfs_break_active_protection(). This will cause the sysfs core not to wait for the attribute's callback routine to return, allowing the removal to proceed. The disadvantage is that after making this call, there is no guarantee that the hub structure won't be deallocated at any moment. To prevent this, we have to acquire a reference to it first by calling hub_get().

Gravité et risque d'exploitation

CVE-2024-26933 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 0.18 %, ce qui la place devant 6.8 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions 6.9, <=6.1.*, <9dac54f08198147f5ec0ec52fcf1bc8ac899ac05, 0, <f51849833705dea5b4f9b0c8de714dd87bd6c95c, 6.8.3, <=6.6.*, 6.0, <f4d1960764d8a70318b02f15203a1be2b2554ca1, f061f43d7418cb62b8d073e221ec75d3f5b89e17, <6.0, <4facc9421117ba9d8148c73771b213887fec77f7, <=6.8.*, 6.7.12, <=*, <=6.7.*, 6.1.84, <73d1589b91f2099e5f6534a8497b7c6b527e064e, 6.6.24) 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/9dac54f08198147f5ec0ec52fcf1bc8ac899ac05
• https://git.kernel.org/stable/c/f51849833705dea5b4f9b0c8de714dd87bd6c95c
• https://git.kernel.org/stable/c/4facc9421117ba9d8148c73771b213887fec77f7
• https://git.kernel.org/stable/c/73d1589b91f2099e5f6534a8497b7c6b527e064e
• https://git.kernel.org/stable/c/f4d1960764d8a70318b02f15203a1be2b2554ca1