---
title: "CVE-2026-89803: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in drm/nouveau caused by improper ordering of channel-kill event unsubscription and fence context teardown, letting attackers cause a kernel crash or denial of service, exploit requires precise timing during channel destruction."
url: https://panop.io/threat-heartbeat/CVE-2026-89803/
---

# CVE-2026-89803 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in drm/nouveau caused by improper ordering of channel-kill event unsubscription and fence context teardown, letting attackers cause a kernel crash or denial of service, exploit requires precise timing during channel destruction.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89803)

## Details

Type

Use After Free

Impact

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 drm/nouveau channel-kill event ordering.

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-2026-89803](https://nvd.nist.gov/vuln/detail/CVE-2026-89803)
- [https://git.kernel.org/stable/c/f3830fdd6930e233d727f29eee1617f7e6a0e9e5](https://git.kernel.org/stable/c/f3830fdd6930e233d727f29eee1617f7e6a0e9e5)
- [https://git.kernel.org/stable/c/f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e](https://git.kernel.org/stable/c/f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e)
- [https://git.kernel.org/stable/c/1fef7553dc628295c1208a4f2ac2094c62886e5d](https://git.kernel.org/stable/c/1fef7553dc628295c1208a4f2ac2094c62886e5d)
- [https://git.kernel.org/stable/c/511585987d27d8cb668acebd399fc4deda23404c](https://git.kernel.org/stable/c/511585987d27d8cb668acebd399fc4deda23404c)

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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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