SB20261007165 - Use-after-free in Linux kernel hwmon driver
Published: October 7, 2026
Security Bulletin ID
SB20261007165
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-98197)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger accesses to freed driver data.
The vulnerability exists due to use-after-free in the w83791d driver's fan/pwm 4-5 sysfs callbacks when accessing leftover sysfs files after driver unbind. A local user can access these leftover files to trigger accesses to freed driver data.
The optional sysfs group is created only when the fan/pwm 4-5 pins are not used as GPIO.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/081e3a78453635fb370b1712809d2af29e60b4c5
- https://git.kernel.org/stable/c/0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8
- https://git.kernel.org/stable/c/2c381e6e0f033f2df13bd64905e7232c42f49009
- https://git.kernel.org/stable/c/2ccf6c512290a288a2d4d7f076430dfb0c6ee476
- https://git.kernel.org/stable/c/2dd37d00f1f1af8e02ffa70ee573c10fd1a76864
- https://git.kernel.org/stable/c/583e04e88e75b8d57304015d83c38e82a9531600
- https://git.kernel.org/stable/c/b1d419eb3bc41245c3d3d99dfe1a7b6c45989586
- https://git.kernel.org/stable/c/f6e2ab72f32d16d71a2549c7ea062dd209f71670