---
title: "CVE-2026-99064: Linux Kernel - Memory Corruption"
description: "Linux kernel contains a vulnerability in cipso_v4_skbuff_delattr() where cached option offsets are not adjusted after removing CIPSO bytes, letting attackers cause incorrect option parsing and potential memory corruption, exploit requires crafted packets."
url: https://panop.io/threat-heartbeat/CVE-2026-99064/
---

# CVE-2026-99064 Linux Kernel - Memory Corruption

Linux kernel contains a vulnerability in cipso\_v4\_skbuff\_delattr() where cached option offsets are not adjusted after removing CIPSO bytes, letting attackers cause incorrect option parsing and potential memory corruption, exploit requires crafted packets.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-99064)

## Details

Type

Memory Corruption

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/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 cipso option offset adjustment.

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-2026-99064](https://nvd.nist.gov/vuln/detail/CVE-2026-99064)
- [https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f](https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f)
- [https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b](https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b)
- [https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0](https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0)
- [https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3](https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3)

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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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