CVE-2026-98000
UnknownSummary
In the Linux kernel pec_store() takes a guard(mutex)(&hwdev->lock). If the chip write operation returns an error other than -EOPNOTSUPP, the code jumps to the put label, which calls put_device(hdev); if this drops the final reference, the device is freed, and when the function returns the guard cleanup attempts to unlock the freed mutex (UAF). The fix uses scoped_guard() instead of guard().
Risk Assessment
A use-after-free on a freed mutex can lead to memory corruption, kernel panic, or potential code execution. This may result in denial of service or privilege escalation.
Recommendation
Update the Linux kernel to a version containing the fix. On systems using hwmon and PEC operations, prioritizing this update is recommended.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: hwmon: Fix potential UAF in pec_store Sashiko reports: In pec_store(), a guard(mutex)(&hwdev->lock) is taken. If the chip write operation returns an error other than -EOPNOTSUPP, the code jumps to the put label, which calls put_device(hdev). If this drops the final reference, the device is freed. When the function then returns, the guard cleanup function runs and attempts to unlock the freed mutex. Use scoped_guard() instead of guard() to avoid the problem.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS