---
title: "CVE-2026-93221: Linux Kernel - Race Condition"
description: "Linux kernel contains a race condition in nfsd_net boolean flags accessed concurrently without serialization, causing double-free and memory corruption, letting attackers cause denial of service, exploit requires concurrent access to nfsd_net flags."
url: https://panop.io/threat-heartbeat/CVE-2026-93221/
---

# CVE-2026-93221 Linux Kernel - Race Condition

Linux kernel contains a race condition in nfsd\_net boolean flags accessed concurrently without serialization, causing double-free and memory corruption, letting attackers cause denial of service, exploit requires concurrent access to nfsd\_net flags.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93221)

## Details

Type

Race Condition

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

24 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for nfsd\_net flag race condition.

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-2026-93221](https://nvd.nist.gov/vuln/detail/CVE-2026-93221)
- [https://git.kernel.org/stable/c/11a5fe42e1811f793e04ef885b639ea7668f439d](https://git.kernel.org/stable/c/11a5fe42e1811f793e04ef885b639ea7668f439d)
- [https://git.kernel.org/stable/c/df5922fe09a8131c793ffa86adf204999b0470f8](https://git.kernel.org/stable/c/df5922fe09a8131c793ffa86adf204999b0470f8)
- [https://git.kernel.org/stable/c/40bab0da844c142431a6b1cc21b4cf53491dac44](https://git.kernel.org/stable/c/40bab0da844c142431a6b1cc21b4cf53491dac44)

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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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