---
title: "CVE-2026-89771: Linux Kernel - Race Condition"
description: "Linux kernel contains a race condition in ring buffer subbuffer resizing caused by concurrent access to trace_buffer subbuf_size, letting attackers cause data corruption or denial of service, exploit requires concurrent ring buffer access."
url: https://panop.io/threat-heartbeat/CVE-2026-89771/
---

# CVE-2026-89771 Linux Kernel - Race Condition

Linux kernel contains a race condition in ring buffer subbuffer resizing caused by concurrent access to trace\_buffer subbuf\_size, letting attackers cause data corruption or denial of service, exploit requires concurrent ring buffer access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89771)

## Details

Type

Race Condition

Impact

Denial Of Service, Data Tampering

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

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89771](https://nvd.nist.gov/vuln/detail/CVE-2026-89771)
- [https://git.kernel.org/stable/c/0c7c517827a453128a8f58bfd849546a29813b27](https://git.kernel.org/stable/c/0c7c517827a453128a8f58bfd849546a29813b27)
- [https://git.kernel.org/stable/c/50f4a793c4ff24826efb0ac700989a5063cc53df](https://git.kernel.org/stable/c/50f4a793c4ff24826efb0ac700989a5063cc53df)
- [https://git.kernel.org/stable/c/6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9](https://git.kernel.org/stable/c/6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9)
- [https://git.kernel.org/stable/c/8a5f63637890f03177146efddaba5ec7a1b4d61f](https://git.kernel.org/stable/c/8a5f63637890f03177146efddaba5ec7a1b4d61f)

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- 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
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