Use-after-free in Linux kernel - CVE-2026-63905
Published: July 20, 2026
Vulnerability identifier: #VU138741
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63905
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in vudc_remove() and the vudc transfer timer handling when racing device teardown with a pending or executing timer. A local user can repeatedly trigger unbind and rebind operations while the timer is active to cause a denial of service.
The issue is triggered by a race condition during the unplug or unbind path.
How to mitigate CVE-2026-63905
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1036ac6148995feaf486014d32bf26bf993c06a9
- https://git.kernel.org/stable/c/207bf80362df3fce8ebc9723351dcb1bc6d9ed0f
- https://git.kernel.org/stable/c/61704e5cf9cd7464b510eb606e7e2978b1160a64
- https://git.kernel.org/stable/c/88d459e5b5a46da1ef9fd6f52d9439343edeec88
- https://git.kernel.org/stable/c/a0638db2340ee053ab0450656a763fd111475e54
- https://git.kernel.org/stable/c/d07ed707467ce05ea9c03412d0c5ee9d0fe386a6
- https://git.kernel.org/stable/c/d96209626a29ea64666be98c30b30ac82e5f1be6
- https://git.kernel.org/stable/c/dcc1c90b28b28b7c493547506297e78653f81952