---
title: "CVE-2026-90235: Linux Kernel - Race Condition"
description: "Linux kernel contains a race condition in sunrpc xprtsock caused by improper synchronization of shared socket callback pointers, letting concurrent CPUs invoke stale callbacks, exploit requires concurrent socket operations."
url: https://panop.io/threat-heartbeat/CVE-2026-90235/
---

# CVE-2026-90235 Linux Kernel - Race Condition

Linux kernel contains a race condition in sunrpc xprtsock caused by improper synchronization of shared socket callback pointers, letting concurrent CPUs invoke stale callbacks, exploit requires concurrent socket operations.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.62% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90235)

## Details

Type

Race Condition

Impact

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

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for proper synchronization of socket callbacks using READ\_ONCE()/WRITE\_ONCE().

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-2026-90235](https://nvd.nist.gov/vuln/detail/CVE-2026-90235)
- [https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481](https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481)
- [https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe](https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe)
- [https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43](https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43)
- [https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664](https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664)
- [https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae](https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae)

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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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