---
title: "CVE-2026-89545: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by premature freeing of rq_argp and rq_resp in sunrpc component, letting attackers cause memory corruption or denial of service, exploit requires concurrent RCU readers."
url: https://panop.io/threat-heartbeat/CVE-2026-89545/
---

# CVE-2026-89545 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by premature freeing of rq\_argp and rq\_resp in sunrpc component, letting attackers cause memory corruption or denial of service, exploit requires concurrent RCU readers.

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-2026-89545)

## 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

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for sunrpc use-after-free.

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-2026-89545](https://nvd.nist.gov/vuln/detail/CVE-2026-89545)
- [https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6](https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6)
- [https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf](https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf)
- [https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090](https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090)
- [https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967](https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967)

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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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