🛡️ CVE-2025-40223 — kernel

⚪ Unknown ✅ No Known Exploit NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

most: usb: Fix use-after-free in hdm_disconnect

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.

Affected software

CVE-2025-40223 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.17.6)
  • unknown

Timeline and source

Published on 4 December 2025 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-40223 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-12-04
Updated 2026-08-12
Modified 2026-07-15
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.17.6
unknown — —

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