---
title: "CVE-2026-89940: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in iio_dma_fence caused by improper lock lifetime management in iio_dmabuf_priv, letting attackers cause memory corruption, exploit requires triggering fence release callbacks."
url: https://panop.io/threat-heartbeat/CVE-2026-89940/
---

# CVE-2026-89940 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in iio\_dma\_fence caused by improper lock lifetime management in iio\_dmabuf\_priv, letting attackers cause memory corruption, exploit requires triggering fence release callbacks.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89940)

## Details

Type

Use After Free

Impact

Use After Free, Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for iio\_dma\_fence lock lifetime.

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-2026-89940](https://nvd.nist.gov/vuln/detail/CVE-2026-89940)
- [https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081](https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081)
- [https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb](https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb)
- [https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5](https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5)
- [https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611](https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611)

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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

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