---
title: "CVE-2026-98197: Linux kernel hwmon w83791d - Use After Free"
description: "Linux kernel hwmon w83791d driver contains a use-after-free vulnerability caused by incomplete sysfs group removal on driver unbind, letting attackers access stale driver data, exploit requires driver unbind with fan/pwm 4-5 pins not used as GPIO."
url: https://panop.io/threat-heartbeat/CVE-2026-98197/
---

# CVE-2026-98197 Linux kernel hwmon w83791d - Use After Free

Linux kernel hwmon w83791d driver contains a use-after-free vulnerability caused by incomplete sysfs group removal on driver unbind, letting attackers access stale driver data, exploit requires driver unbind with fan/pwm 4-5 pins not used as GPIO.

CVSS base score 7.0 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98197)

## Details

Type

Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

6 October 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-98197](https://nvd.nist.gov/vuln/detail/CVE-2026-98197)
- [https://git.kernel.org/stable/c/583e04e88e75b8d57304015d83c38e82a9531600](https://git.kernel.org/stable/c/583e04e88e75b8d57304015d83c38e82a9531600)
- [https://git.kernel.org/stable/c/b1d419eb3bc41245c3d3d99dfe1a7b6c45989586](https://git.kernel.org/stable/c/b1d419eb3bc41245c3d3d99dfe1a7b6c45989586)
- [https://git.kernel.org/stable/c/f6e2ab72f32d16d71a2549c7ea062dd209f71670](https://git.kernel.org/stable/c/f6e2ab72f32d16d71a2549c7ea062dd209f71670)
- [https://git.kernel.org/stable/c/081e3a78453635fb370b1712809d2af29e60b4c5](https://git.kernel.org/stable/c/081e3a78453635fb370b1712809d2af29e60b4c5)
- [https://git.kernel.org/stable/c/0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8](https://git.kernel.org/stable/c/0ff9c7775e51ac6d47b1bb5c46f06b1434fe58a8)
- [https://git.kernel.org/stable/c/2c381e6e0f033f2df13bd64905e7232c42f49009](https://git.kernel.org/stable/c/2c381e6e0f033f2df13bd64905e7232c42f49009)
- [https://git.kernel.org/stable/c/2ccf6c512290a288a2d4d7f076430dfb0c6ee476](https://git.kernel.org/stable/c/2ccf6c512290a288a2d4d7f076430dfb0c6ee476)
- [https://git.kernel.org/stable/c/2dd37d00f1f1af8e02ffa70ee573c10fd1a76864](https://git.kernel.org/stable/c/2dd37d00f1f1af8e02ffa70ee573c10fd1a76864)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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