---
title: "CVE-2026-89748: Linux Kernel - Race Condition"
description: "Linux kernel contains a race condition in simple ring buffer reader swap caused by incorrect retry counter handling in simple_ring_buffer_swap_reader_page(), letting attackers cause ring buffer corruption, exploit requires kernel tracing enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-89748/
---

# CVE-2026-89748 Linux Kernel - Race Condition

Linux kernel contains a race condition in simple ring buffer reader swap caused by incorrect retry counter handling in simple\_ring\_buffer\_swap\_reader\_page(), letting attackers cause ring buffer corruption, exploit requires kernel tracing enabled.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89748)

## Details

Type

Race Condition

Impact

Data Tampering, 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 containing the fix for simple\_ring\_buffer\_swap\_reader\_page() retry exhaustion.

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-2026-89748](https://nvd.nist.gov/vuln/detail/CVE-2026-89748)
- [https://git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268](https://git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268)
- [https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde](https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde)

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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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