---
id: CVE-2026-80995
title: >-
  kernel: net: mctp: hold a reference to the route device in mctp_route_lookup()
  (CVE-2026-80995)
summary: >-
  A flaw was found in the Linux kernel's MCTP (Message Control Transport
  Protocol) networking implementation. This vulnerability arises because the
  `mctp_route_lookup()` function accesses a route device without holding a
  persistent reference…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-825
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:16:15+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80995.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80995.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80995'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532081'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80995'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80995'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80995.mbox
  - url: 'https://git.kernel.org/stable/c/408da1df18116c971c3392e21e50586688cd3fbf'
  - url: 'https://git.kernel.org/stable/c/cc561f8af25586300c2f9d285babb163b866b293'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.0012
epssPercentile: 0.02114
scores:
  vendor: 4.7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

A flaw was found in the Linux kernel's MCTP (Message Control Transport Protocol) networking implementation. This vulnerability arises because the `mctp_route_lookup()` function accesses a route device without holding a persistent reference, allowing the device to be deallocated while still in use. A local, unprivileged user can exploit this condition on the receive/forwarding path, leading to a use-after-free. This can result in memory corruption or a denial of service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80995.json)

**kernel: net: mctp: hold a reference to the route device in mctp_route_lookup()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.