NULL pointer dereference in Linux kernel - CVE-2026-74552
Published: August 16, 2026
Vulnerability identifier: #VU143231
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-2026-74552
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 the lm90 hwmon driver alarm reporting logic when reading sysfs attributes before driver registration is complete. A local user can read sysfs attributes during device initialization to cause a denial of service.
The issue occurs because alarm reporting work may be scheduled before data->hwmon_dev is initialized.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74552
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/075fce376cf852db9293481edce07c181a9b1f46
- https://git.kernel.org/stable/c/4eed33c7db5c0c573928d28d8a2c003642c679b8
- https://git.kernel.org/stable/c/70d9a71aa407044d70b50d356b6decf6659c4d56
- https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117
- https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58