---
title: "CVE-2026-81000: Linux Kernel net tun - Buffer Overflow"
description: "Linux kernel net tun driver contains a buffer overflow caused by improper handling of skb headroom and alignment in tun_get_user(), letting attackers cause memory corruption, exploit requires crafted oversized headroom request."
url: https://panop.io/threat-heartbeat/CVE-2026-81000/
---

# CVE-2026-81000 Linux Kernel net tun - Buffer Overflow

Linux kernel net tun driver contains a buffer overflow caused by improper handling of skb headroom and alignment in tun\_get\_user(), letting attackers cause memory corruption, exploit requires crafted oversized headroom request.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-81000)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

11 September 2026

Updated

15 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-2026-81000](https://nvd.nist.gov/vuln/detail/CVE-2026-81000)
- [https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2](https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2)
- [https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43](https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43)
- [https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76](https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76)
- [https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60](https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60)
- [https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491](https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491)
- [https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28](https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28)
- [https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d](https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d)
- [https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7](https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7)

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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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