CVE-2026-80952

Description

In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix info leak and UAF in device unregister path i3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before calling device_unregister(). During device_unregister(), device_del() emits a KOBJ_REMOVE uevent and unbinds the driver while the device descriptor is still expected to be valid. As a result, i3c_device_uevent() and a racing modalias_show() can observe a NULL desc and fall back to an uninitialized stack struct i3c_device_info, leaking kernel stack contents in the generated modalias. Driver .remove() callbacks may also encounter an unexpected NULL desc during unbind. Keep desc valid until device_unregister() has completed. Since device_unregister() drops the device reference and may free the device, take an extra reference with get_device() before unregistering. Clear desc afterwards and release the extra reference with put_device(). This preserves the release-time invariant that desc must be NULL while avoiding both the information leak and a potential use-after-free from writing desc after the device has been released.

Gravité et risque d'exploitation

CVE-2026-80952 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 0.13 %, ce qui la place devant 2.0 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <4837be0f9ac2efe5e83b35a696b6242c473d280c, <=6.12.*, 5.15.221, 5.10.270, <109995153898454c7795c2c299fd0a0b57456a4b, 0, 7.2.4, 6.1.188, 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, <=5.10.*, <=6.6.*, 5.0, 6.6.157, <c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49, <5.0, <=6.18.*, <d2c743efd2d1ee64e94324664808f623dd865872, <c64daaaba08e490c8347ff60aacac4dd51249f91, <94fb9786d67a8f8b899e77381620f86bad94fdf7, <=7.2.*, <334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e, <=*, <=5.15.*, 6.18.50, <ef72ff6650c4ebf2b444708d84df66db42f262d9, 6.12.109, 7.3) 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/334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e
• https://git.kernel.org/stable/c/109995153898454c7795c2c299fd0a0b57456a4b
• https://git.kernel.org/stable/c/c64daaaba08e490c8347ff60aacac4dd51249f91
• https://git.kernel.org/stable/c/ef72ff6650c4ebf2b444708d84df66db42f262d9
• https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49
• https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7
• https://git.kernel.org/stable/c/4837be0f9ac2efe5e83b35a696b6242c473d280c
• https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872