Improper resource shutdown or release in Linux kernel - CVE-2026-64338
Published: July 27, 2026
Vulnerability identifier: #VU139644
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64338
CWE-ID: CWE-404
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 attacker to cause a denial of service.
The vulnerability exists due to improper resource shutdown or release in uss720_probe() when handling a probe failure after reading the 1284 register. A local attacker can trigger a failed probe with a device that causes get_1284_register() to fail to cause a denial of service.
The issue can leave a registered parport device behind with stale private_data after the common cleanup path releases the associated private data and USB device reference.
How to mitigate CVE-2026-64338
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0b3073f40cc9f95d5ff0037eb0a06f5c1725a7ea
- https://git.kernel.org/stable/c/1712fd71a5aaf81e47c747f180535fa963ad7830
- https://git.kernel.org/stable/c/48dd0b2ec9f2e97c486eb68cd0a64b25c1c3df3e
- https://git.kernel.org/stable/c/5e62d7857fd51b908b8371062ee839739a086bbe
- https://git.kernel.org/stable/c/6bbb98bec71b577fda4f4b48f7aea5874b04a576
- https://git.kernel.org/stable/c/729b68a5bad71220ae0914c8bdab9488ad5be6c8
- https://git.kernel.org/stable/c/93563243377f8e9b46cc94d9c4f06533dd31b141
- https://git.kernel.org/stable/c/b4ecbdc4f8830f5586c4a5cfc384c00f20f8f8b3