Not yet scoredPublished Dec 4, 2025

CVE-2025-40223most: usb: Fix use-after-free in hdm_disconnect

Updated under an hour ago (Oct 27, 2026, 4:23 PM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: most: usb: Fix use-after-free in hdm_disconnect hdm_disconnect() calls most_deregister_interface(), which eventually unregisters the MOST interface device with device_unregister(iface->dev). If that drops the last reference, the device core may call release_mdev() immediately while hdm_disconnect() is still executing. The old code also freed several mdev-owned allocations in hdm_disconnect() and then performed additional put_device() calls. Depending on refcount order, this could lead to use-after-free or double-free when release_mdev() ran (or when unregister paths also performed puts). Fix by moving the frees of mdev-owned allocations into release_mdev(), so they happen exactly once when the device is truly released, and by dropping the extra put_device() calls in hdm_disconnect() that are redundant after device_unregister() and most_deregister_interface(). This addresses the KASAN slab-use-after-free reported by syzbot in hdm_disconnect(). See report and stack traces in the bug link below.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	97a6f772f36b7f52bcfa56a581bbd2470cffe23d builds before 5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831; from 97a6f772f36b7f52bcfa56a581bbd2470cffe23d before 578eb18cd111addec94c43f61cd4b4429e454809; 97a6f772f36b7f52bcfa56a581bbd2470cffe23d builds before 33daf469f5294b9d07c4fc98216cace9f4f34cc6; from 97a6f772f36b7f52bcfa56a581bbd2470cffe23d before 72427dc6f87523995f4e6ae35a948bb2992cabce; from 97a6f772f36b7f52bcfa56a581bbd2470cffe23d before f93a84ffb884d761a9d4e869ba29c238711e81f1; 97a6f772f36b7f52bcfa56a581bbd2470cffe23d builds before 3a3b8e89c7201c5b3b76ac4a4069d1adde1477d6; 97a6f772f36b7f52bcfa56a581bbd2470cffe23d builds before 4b1270902609ef0d935ed2faa2ea6d122bd148f5	CNA record

References

References

https://git.kernel.org/stable/c/5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831
https://git.kernel.org/stable/c/578eb18cd111addec94c43f61cd4b4429e454809
https://git.kernel.org/stable/c/33daf469f5294b9d07c4fc98216cace9f4f34cc6
https://git.kernel.org/stable/c/72427dc6f87523995f4e6ae35a948bb2992cabce
https://git.kernel.org/stable/c/f93a84ffb884d761a9d4e869ba29c238711e81f1
https://git.kernel.org/stable/c/3a3b8e89c7201c5b3b76ac4a4069d1adde1477d6
https://git.kernel.org/stable/c/4b1270902609ef0d935ed2faa2ea6d122bd148f5

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.