SB20260727376 - Race condition in Linux kernel hwmon driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64213)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 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]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the lm90_alert handler when handling concurrent smbus alert events and sysfs write operations. A local user can trigger concurrent alert and sysfs write activity to cause a denial of service.

The issue can unintentionally re-enable the hardware alert line while the alarm remains active, resulting in an interrupt storm.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf
• https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186
• https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2