---
title: "CVE-2026-99056: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in strparser due to race condition between strp_recv and strp_done, letting attackers cause crashes or potential exploits, exploit requires triggering concurrent parser teardown and receive operations."
url: https://panop.io/threat-heartbeat/CVE-2026-99056/
---

# CVE-2026-99056 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in strparser due to race condition between strp\_recv and strp\_done, letting attackers cause crashes or potential exploits, exploit requires triggering concurrent parser teardown and receive operations.

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-2026-99056)

## Details

Type

Use After Free

Impact

Denial Of Service, Privilege Escalation

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.

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-2026-99056](https://nvd.nist.gov/vuln/detail/CVE-2026-99056)
- [https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf](https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf)
- [https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1](https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1)
- [https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449](https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449)
- [https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f](https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f)
- [https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc](https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc)

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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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