SB20260720326 - Use-after-free in Linux kernel usb usbip driver
Published: July 20, 2026
Security Bulletin ID
SB20260720326
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-63905)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [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]
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.
Remediation
Install update from vendor's website.
References
- 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