---
title: "CVE-2026-90051: Linux Kernel - Denial of Service"
description: "Linux kernel contains a vulnerability in tcp_sendmsg_locked where devmem tcp tx is not properly enforced without zero-copy, causing potential data copy errors and invariant breaks, letting attackers cause denial of service, exploit requires crafted io_uring requests with dmabuf_id and zero-copy flags."
url: https://panop.io/threat-heartbeat/CVE-2026-90051/
---

# CVE-2026-90051 Linux Kernel - Denial of Service

Linux kernel contains a vulnerability in tcp\_sendmsg\_locked where devmem tcp tx is not properly enforced without zero-copy, causing potential data copy errors and invariant breaks, letting attackers cause denial of service, exploit requires crafted io\_uring requests with dmabuf\_id and zero-copy flags.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90051)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the patch enforcing zero-copy devmem tx.

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-2026-90051](https://nvd.nist.gov/vuln/detail/CVE-2026-90051)
- [https://git.kernel.org/stable/c/125755776bc6d4dd53eaf551c87e3d460625d638](https://git.kernel.org/stable/c/125755776bc6d4dd53eaf551c87e3d460625d638)
- [https://git.kernel.org/stable/c/2151b2bcf6fcec52665f606eed20da068447f0b7](https://git.kernel.org/stable/c/2151b2bcf6fcec52665f606eed20da068447f0b7)
- [https://git.kernel.org/stable/c/b04326c7927af7048fd4e730f5770cca350d0a60](https://git.kernel.org/stable/c/b04326c7927af7048fd4e730f5770cca350d0a60)

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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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