---
title: "CVE-2026-89548: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in SUNRPC due to improper handling of cache_cleaner delayed_work during cache_detail destruction, letting attackers cause memory corruption, exploit requires kernel-level access."
url: https://panop.io/threat-heartbeat/CVE-2026-89548/
---

# CVE-2026-89548 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in SUNRPC due to improper handling of cache\_cleaner delayed\_work during cache\_detail destruction, letting attackers cause memory corruption, exploit requires kernel-level access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.13% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89548)

## Details

Type

Use After Free

Impact

Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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 with the fix for SUNRPC cache\_cleaner handling.

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-2026-89548](https://nvd.nist.gov/vuln/detail/CVE-2026-89548)
- [https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726](https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726)
- [https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890](https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890)
- [https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377](https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377)
- [https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5](https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5)
- [https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714](https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714)
- [https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040](https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040)
- [https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9](https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9)
- [https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b](https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b)

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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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