Race condition in Linux kernel - CVE-2026-80547
Published: August 27, 2026
Vulnerability identifier: #VU145944
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80547
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to a race condition in the vfio_ccw crw handling logic when processing asynchronous hardware events and userspace reads of the crw region. A local user can trigger concurrent access to the crw list to disclose sensitive information, modify data, or cause a denial of service.
The issue affects the s390 vfio_ccw subsystem and involves the crw queue being accessed from asynchronous hardware-driven paths.
Affected software
Linux kernel
How to mitigate CVE-2026-80547
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3