---
title: "CVE-2026-89968: Linux Kernel nvmet-tcp - Denial of Service"
description: "Linux kernel nvmet-tcp contains a denial of service caused by accepting unsolicited H2CData PDUs without verifying R2T transmission, letting remote attackers cause kernel BUG or soft-lockup, exploit requires no authentication on allow_any_host subsystem."
url: https://panop.io/threat-heartbeat/CVE-2026-89968/
---

# CVE-2026-89968 Linux Kernel nvmet-tcp - Denial of Service

Linux kernel nvmet-tcp contains a denial of service caused by accepting unsolicited H2CData PDUs without verifying R2T transmission, letting remote attackers cause kernel BUG or soft-lockup, exploit requires no authentication on allow\_any\_host subsystem.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.82% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89968)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for unsolicited H2CData PDU rejection.

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-2026-89968](https://nvd.nist.gov/vuln/detail/CVE-2026-89968)
- [https://git.kernel.org/stable/c/cade124c06f8e738e3a0df285ed2e08953e6bfaa](https://git.kernel.org/stable/c/cade124c06f8e738e3a0df285ed2e08953e6bfaa)
- [https://git.kernel.org/stable/c/cf1484d9a75de6809ef331e16f525aaa41b0e16d](https://git.kernel.org/stable/c/cf1484d9a75de6809ef331e16f525aaa41b0e16d)
- [https://git.kernel.org/stable/c/db62b35cbca052860c519cbcabe7650708528738](https://git.kernel.org/stable/c/db62b35cbca052860c519cbcabe7650708528738)
- [https://git.kernel.org/stable/c/02341ee424fb2eed16b5b8a9d247492e49335c21](https://git.kernel.org/stable/c/02341ee424fb2eed16b5b8a9d247492e49335c21)
- [https://git.kernel.org/stable/c/14beef7d4f123fb458fc9844aa74a071871dcca6](https://git.kernel.org/stable/c/14beef7d4f123fb458fc9844aa74a071871dcca6)
- [https://git.kernel.org/stable/c/1cbed7538946c99e585acefd11c9ba3a0bdbae05](https://git.kernel.org/stable/c/1cbed7538946c99e585acefd11c9ba3a0bdbae05)
- [https://git.kernel.org/stable/c/2b71f9193e3d3a352920ba367f1a6db345249038](https://git.kernel.org/stable/c/2b71f9193e3d3a352920ba367f1a6db345249038)
- [https://git.kernel.org/stable/c/9fb527103e53fd43a8e802c2eca407869c204f7a](https://git.kernel.org/stable/c/9fb527103e53fd43a8e802c2eca407869c204f7a)

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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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