SB2026082788 - Improper locking in Linux kernel s390 cio driver
Published: August 27, 2026
Security Bulletin ID
SB2026082788
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-80549)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to improper locking in the vfio_ccw driver when handling a device transitioning to a not-operational state. A local privileged user can trigger this condition to cause a denial of service.
The cleanup may occur asynchronously while other locks are held in the calling sequence.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0c11f61a876ed6fcca53d442ed3f33ea8362a0f9
- https://git.kernel.org/stable/c/4e3301e2a651d742c05914f6074a25b8e41bce19
- https://git.kernel.org/stable/c/56100baa0eb7055b1026dfa73e696e8066ff71fd
- https://git.kernel.org/stable/c/af1759d8e6e6da9ba94f30a2f92546f406899aa7
- https://git.kernel.org/stable/c/f98a9890ca42f4223d2d4c50e0660af3e012fcb4