Race condition in Linux kernel - CVE-2026-53400
Published: July 21, 2026
Vulnerability identifier: #VU138860
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-53400
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the i2c adapter registration logic when looking up adapters by id during registration. A local user can trigger concurrent adapter lookup and registration activity to cause a denial of service.
The issue can lead to access to uninitialized adapter data, including NULL-pointer dereferences or use-after-free.
Affected software
Linux kernel
How to mitigate CVE-2026-53400
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3