---
title: "CVE-2026-89677: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in nfsd4_create_file caused by improper handling of dentry in fh_compose, letting attackers cause memory corruption, exploit requires NFS exported filesystem with specific filehandle conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-89677/
---

# CVE-2026-89677 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in nfsd4\_create\_file caused by improper handling of dentry in fh\_compose, letting attackers cause memory corruption, exploit requires NFS exported filesystem with specific filehandle conditions.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.55% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89677)

## Details

Type

Use After Free

Impact

Use After Free, Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89677](https://nvd.nist.gov/vuln/detail/CVE-2026-89677)
- [https://git.kernel.org/stable/c/033e783709ce99662cf81f6abcad746a8da9d35f](https://git.kernel.org/stable/c/033e783709ce99662cf81f6abcad746a8da9d35f)
- [https://git.kernel.org/stable/c/3e2c79360c6a89975ec5b5a7d4ef937e4db91a27](https://git.kernel.org/stable/c/3e2c79360c6a89975ec5b5a7d4ef937e4db91a27)

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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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