Race condition in Linux kernel - CVE-2026-63977
Published: July 20, 2026
Vulnerability identifier: #VU138679
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-2026-63977
CWE-ID: CWE-362
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 a race condition in the zl3073x DPLL device change notification handling in drivers/dpll/zl3073x/dpll.c when unregistering a DPLL device during notification processing. A local user can trigger device change notifications during device teardown to cause a denial of service.
The issue could result in dereferencing a freed or NULL dpll_dev pointer.
How to mitigate CVE-2026-63977
Install security update from vendor's repository.