NULL pointer dereference in Linux kernel - CVE-2026-89457
Published: September 12, 2026
Vulnerability identifier: #VU149353
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-2026-89457
CWE-ID: CWE-476
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 null pointer dereference in s390 DASD sysfs discipline callbacks when reading world-readable sysfs attributes during device initialization. A local user can read a sysfs attribute before private device data is allocated to trigger a kernel panic and cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89457
Install security update from vendor's repository.