---
title: "CVE-2026-99054: Linux Kernel tipc - Race Condition"
description: "Linux kernel tipc contains a race condition caused by improper teardown order of topsrv workqueues and connections, letting attackers trigger use-after-free and denial of service, exploit requires triggering concurrent connection teardown."
url: https://panop.io/threat-heartbeat/CVE-2026-99054/
---

# CVE-2026-99054 Linux Kernel tipc - Race Condition

Linux kernel tipc contains a race condition caused by improper teardown order of topsrv workqueues and connections, letting attackers trigger use-after-free and denial of service, exploit requires triggering concurrent connection teardown.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-99054)

## Details

Type

Race Condition

Impact

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

23 October 2026

Updated

25 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for tipc topsrv workqueue teardown.

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-2026-99054](https://nvd.nist.gov/vuln/detail/CVE-2026-99054)
- [https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d](https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d)
- [https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af](https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af)
- [https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37](https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37)
- [https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9](https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9)
- [https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e](https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e)

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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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