---
title: "CVE-2026-89682: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in nfsd due to a separately allocated fcache disposal structure being freed prematurely, letting attackers cause memory corruption, exploit requires triggering nfsd file disposal during net namespace teardown."
url: https://panop.io/threat-heartbeat/CVE-2026-89682/
---

# CVE-2026-89682 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in nfsd due to a separately allocated fcache disposal structure being freed prematurely, letting attackers cause memory corruption, exploit requires triggering nfsd file disposal during net namespace teardown.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.53% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89682)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for fcache disposal UAF.

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-2026-89682](https://nvd.nist.gov/vuln/detail/CVE-2026-89682)
- [https://git.kernel.org/stable/c/ba0ee9e04b7a0356c28d5a2fe445db675d24e572](https://git.kernel.org/stable/c/ba0ee9e04b7a0356c28d5a2fe445db675d24e572)
- [https://git.kernel.org/stable/c/bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4](https://git.kernel.org/stable/c/bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4)
- [https://git.kernel.org/stable/c/cadc9036d5a8209f89e7026ddba7cfb1c716b03c](https://git.kernel.org/stable/c/cadc9036d5a8209f89e7026ddba7cfb1c716b03c)

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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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