---
title: "CVE-2026-99218: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by releasing parked threads without holding RCU in coredump_finish(), letting attackers cause kernel memory corruption or crash, exploit requires kernel coredump processing."
url: https://panop.io/threat-heartbeat/CVE-2026-99218/
---

# CVE-2026-99218 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by releasing parked threads without holding RCU in coredump\_finish(), letting attackers cause kernel memory corruption or crash, exploit requires kernel coredump processing.

CVSS base score 7.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-99218)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:H/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 coredump RCU 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-2026-99218](https://nvd.nist.gov/vuln/detail/CVE-2026-99218)
- [https://git.kernel.org/stable/c/0fce73efee40c65ce26641c5d93942462f9e8307](https://git.kernel.org/stable/c/0fce73efee40c65ce26641c5d93942462f9e8307)
- [https://git.kernel.org/stable/c/16e94ed90b1b02398e044d41fd1db34828daa08e](https://git.kernel.org/stable/c/16e94ed90b1b02398e044d41fd1db34828daa08e)
- [https://git.kernel.org/stable/c/71146c437bae59e5280f657965dc6d006ee3989b](https://git.kernel.org/stable/c/71146c437bae59e5280f657965dc6d006ee3989b)
- [https://git.kernel.org/stable/c/a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c](https://git.kernel.org/stable/c/a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c)
- [https://git.kernel.org/stable/c/b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573](https://git.kernel.org/stable/c/b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573)
- [https://git.kernel.org/stable/c/fd0fbe84312fda2fc187428c92c50b7d03a9d24c](https://git.kernel.org/stable/c/fd0fbe84312fda2fc187428c92c50b7d03a9d24c)

[← 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)