---
title: "CVE-2026-99238: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by missing trace_types_lock when updating modules in persistent tracing instances, letting attackers cause memory corruption or denial of service, exploit requires concurrent module load or unload."
url: https://panop.io/threat-heartbeat/CVE-2026-99238/
---

# CVE-2026-99238 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by missing trace\_types\_lock when updating modules in persistent tracing instances, letting attackers cause memory corruption or denial of service, exploit requires concurrent module load or unload.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-99238)

## Details

Type

Use After Free

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

2 November 2026

Updated

3 November 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for trace\_types\_lock handling.

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-2026-99238](https://nvd.nist.gov/vuln/detail/CVE-2026-99238)
- [https://git.kernel.org/stable/c/244c442f54601a24c86ad90572bf36fc3df41c5e](https://git.kernel.org/stable/c/244c442f54601a24c86ad90572bf36fc3df41c5e)
- [https://git.kernel.org/stable/c/57408eac99b0d8a005796346d317d31f0ca4e07a](https://git.kernel.org/stable/c/57408eac99b0d8a005796346d317d31f0ca4e07a)
- [https://git.kernel.org/stable/c/dab2bd4d67ad5eaa95019a9511f8d379401b5021](https://git.kernel.org/stable/c/dab2bd4d67ad5eaa95019a9511f8d379401b5021)

[← 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)