SB2026062528 - Use-after-free in Linux kernel s390 cio driver
Published: June 25, 2026
Security Bulletin ID
SB2026062528
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-2026-53117)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the s390 cio driver_override handling when probing a driver through __driver_attach__(). A local user can trigger driver matching on a device with a stale driver_override reference to cause a denial of service.
The issue occurs because the bus match callback may access driver_override without the device lock held.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/106d594711e97762788046c5bbb94f580abc4bf4
- https://git.kernel.org/stable/c/2081957d8c323ffb58a10bc64837717ac5a042a1
- https://git.kernel.org/stable/c/ac4d8bb6e2e13e8684a76ea48d13ebaaaf5c24c4
- https://git.kernel.org/stable/c/b660ba045b2b22cf3b4be72773de00cb48f47be5
- https://git.kernel.org/stable/c/c4295487124f461405e1ef64dfa8c4ab0cb7ebcf