CVE-2025-40092

usb: gadget: f_ncm: Refactor bind path to use __free()

State: Published
Severity: 7.8 High
Published: Oct 30, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_ncm: Refactor bind path to use __free()

After an bind/unbind cycle, the ncm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request.

Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism.

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Call trace: usb_ep_free_request+0x2c/0xec ncm_bind+0x39c/0x3dc usb_add_function+0xcc/0x1f0 configfs_composite_bind+0x468/0x588 gadget_bind_driver+0x104/0x270 really_probe+0x190/0x374 __driver_probe_device+0xa0/0x12c driver_probe_device+0x3c/0x218 __device_attach_driver+0x14c/0x188 bus_for_each_drv+0x10c/0x168 __device_attach+0xfc/0x198 device_initial_probe+0x14/0x24 bus_probe_device+0x94/0x11c device_add+0x268/0x48c usb_add_gadget+0x198/0x28c dwc3_gadget_init+0x700/0x858 __dwc3_set_mode+0x3cc/0x664 process_scheduled_works+0x1d8/0x488 worker_thread+0x244/0x334 kthread+0x114/0x1bc ret_from_fork+0x10/0x20

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	9f6ce4240a2bf456402c15c06768059e5973f28c to before 185193a4714aa9c78437a7a1858fbe5771f0f45cAffected 9f6ce4240a2bf456402c15c06768059e5973f28c to before f37de8dec6a4c379b4b8486003a1de00ff8cff3bAffected 9f6ce4240a2bf456402c15c06768059e5973f28c to before 1cde4516295a030cb8ab4c93114ca3b6c3c6a1e2Affected 9f6ce4240a2bf456402c15c06768059e5973f28c to before d3fe7143928d8dfa2ec7bac9f906b48bc75b98eeAffected 9f6ce4240a2bf456402c15c06768059e5973f28c to before ed78f4d6079d872432b1ed54f155ef61965d3137Affected 9f6ce4240a2bf456402c15c06768059e5973f28c to before 75a5b8d4ddd4eb6b16cb0b475d14ff4ae64295efAffected
LinuxLinux	2.6.38Affected before 2.6.38Not affected 5.15.196 through 5.15.Not affected 6.1.158 through 6.1.Not affected 6.6.114 through 6.6.Not affected 6.12.55 through 6.12.Not affected 6.17.5 through 6.17.*Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

9f6ce4240a2bf456402c15c06768059e5973f28c to before 185193a4714aa9c78437a7a1858fbe5771f0f45cAffected
9f6ce4240a2bf456402c15c06768059e5973f28c to before f37de8dec6a4c379b4b8486003a1de00ff8cff3bAffected
9f6ce4240a2bf456402c15c06768059e5973f28c to before 1cde4516295a030cb8ab4c93114ca3b6c3c6a1e2Affected
9f6ce4240a2bf456402c15c06768059e5973f28c to before d3fe7143928d8dfa2ec7bac9f906b48bc75b98eeAffected
9f6ce4240a2bf456402c15c06768059e5973f28c to before ed78f4d6079d872432b1ed54f155ef61965d3137Affected
9f6ce4240a2bf456402c15c06768059e5973f28c to before 75a5b8d4ddd4eb6b16cb0b475d14ff4ae64295efAffected

LinuxLinux

2.6.38Affected
before 2.6.38Not affected
5.15.196 through 5.15.*Not affected
6.1.158 through 6.1.*Not affected
6.6.114 through 6.6.*Not affected
6.12.55 through 6.12.*Not affected
6.17.5 through 6.17.*Not affected
6.18 and laterNot affected

References

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