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CVE-2026-80824

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 6.6.156, 5.10.269, 0, <4.6, <=7.1.*, <=5.10.*, <=6.6.*, <47a7f98fbb5006d46d15a3a210ffdc61448a4f19, <96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf, f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, <0a960b88c5979f853019d4dc4957dfbeeb193440, 4.6, <=6.18.*, 7.3, <=7.2.*, <65879e0a452ca2a234b9475e0c11aff7a4343738, <b3cde26a66b04f1d90ed0b675899c88b4e49d424, 5.15.220, 7.1.13, 6.18.49, <=*, <=5.15.*, 6.12.108, <bd4bffc621a8cb2f4d9ed9b6447415de524a3bef, <5f08c45bdcfd28d1171de38c5ef29fc89a76eedc, 6.1.187, 7.2.3, <7f0278e474c4d1c4457974ff1137cc385c944ab3, <0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671

Description

In the Linux kernel, the following vulnerability has been resolved: usb: usbfs: fix use-after-free of usb_device in usbdev_release() usbdev_release() drops its reference to the struct usb_device before draining the list of completed async URBs, but that drain path reads back through the same object: free_async() calls dec_usb_memory_use_count() for any URB whose buffer came from the usbfs mmap() region, and its first statement is bus_to_hcd(ps->dev->bus). After a disconnect the usbfs reference can be the last one, in which case usb_put_dev() frees the device and the subsequent loop reads offset 80 of freed memory and uses the result as a struct usb_hcd *, which hcd_buffer_free_pages() then dereferences. This is reachable by an unprivileged process that has read/write access to a /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the mapping, wait for the device to be unplugged, then munmap() and close(). It reproduces on every attempt rather than being a race, because a live MAP_SHARED vma holds a reference on the struct file, so usbdev_release() cannot run until the last vma is gone and the freeing branch of dec_usb_memory_use_count() is always taken. BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410 Read of size 8 at addr ffff8880122ee050 by task poc/769 CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G B 6.12.94 #3 Call Trace: dec_usb_memory_use_count+0x3ae/0x410 free_async+0x2aa/0x4f0 usbdev_release+0x375/0x460 __fput+0x3ea/0xb50 __x64_sys_close+0x86/0x100 Allocated by task 11: usb_alloc_dev+0x55/0xd90 hub_event+0x2524/0x43d0 Freed by task 769: kfree+0x121/0x360 device_release+0xd2/0x280 usb_put_dev+0x23/0x30 usbdev_release+0x2d8/0x460 Release the device reference after the drain loop instead. Nothing between the two points requires it to have been dropped.

Gravité et risque d'exploitation

CVE-2026-80824 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 0.19 %, ce qui la place devant 8.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.6.156, 5.10.269, 0, <4.6, <=7.1.*, <=5.10.*, <=6.6.*, <47a7f98fbb5006d46d15a3a210ffdc61448a4f19, <96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf, f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, <0a960b88c5979f853019d4dc4957dfbeeb193440, 4.6, <=6.18.*, 7.3, <=7.2.*, <65879e0a452ca2a234b9475e0c11aff7a4343738, <b3cde26a66b04f1d90ed0b675899c88b4e49d424, 5.15.220, 7.1.13, 6.18.49, <=*, <=5.15.*, 6.12.108, <bd4bffc621a8cb2f4d9ed9b6447415de524a3bef, <5f08c45bdcfd28d1171de38c5ef29fc89a76eedc, 6.1.187, 7.2.3, <7f0278e474c4d1c4457974ff1137cc385c944ab3, <0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671) 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

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