---
title: "CVE-2026-98899: Linux Kernel netfilter ipset - Race Condition"
description: "Linux kernel contains a race condition in netfilter ipset caused by improper RCU locking, letting attackers potentially cause denial of service or data corruption, exploit requires specific kernel conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-98899/
---

# CVE-2026-98899 Linux Kernel netfilter ipset - Race Condition

Linux kernel contains a race condition in netfilter ipset caused by improper RCU locking, letting attackers potentially cause denial of service or data corruption, exploit requires specific kernel conditions.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98899)

## 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

23 October 2026

Updated

25 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix applied.

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-2026-98899](https://nvd.nist.gov/vuln/detail/CVE-2026-98899)
- [https://git.kernel.org/stable/c/eee5172741b2c0e73210020732043e5d589295d3](https://git.kernel.org/stable/c/eee5172741b2c0e73210020732043e5d589295d3)
- [https://git.kernel.org/stable/c/0c46c9ce24130657ec7460c27fba5d445f5abd06](https://git.kernel.org/stable/c/0c46c9ce24130657ec7460c27fba5d445f5abd06)
- [https://git.kernel.org/stable/c/5d0c22e73656d050daffad10a2ba8765ce8441c8](https://git.kernel.org/stable/c/5d0c22e73656d050daffad10a2ba8765ce8441c8)
- [https://git.kernel.org/stable/c/67bd3d2350d17c2f4fb158c3f917c10b15ecbc94](https://git.kernel.org/stable/c/67bd3d2350d17c2f4fb158c3f917c10b15ecbc94)
- [https://git.kernel.org/stable/c/892399abd1a005a455d5b74d86d82b9773405f2b](https://git.kernel.org/stable/c/892399abd1a005a455d5b74d86d82b9773405f2b)
- [https://git.kernel.org/stable/c/ca9fab1ca15534cef1630e81a479e94b3bbcdb6a](https://git.kernel.org/stable/c/ca9fab1ca15534cef1630e81a479e94b3bbcdb6a)
- [https://git.kernel.org/stable/c/ecb48c6b9edc78de8dd456c365727ae14b88c1ee](https://git.kernel.org/stable/c/ecb48c6b9edc78de8dd456c365727ae14b88c1ee)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)