---
id: CVE-2026-80986
title: >-
  kernel: net/smc: bound the peer rkey counts in SMC-Rv2 LLC messages
  (CVE-2026-80986)
summary: >-
  A flaw was found in the Linux kernel's SMC-Rv2 network component. A remote
  attacker could exploit this vulnerability by sending a specially crafted
  message during an SMC-Rv2 link addition. This can lead to a slab-out-of-bounds
  write, poten…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:49:18+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80986.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80986.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80986'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532205'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80986'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80986'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80986.mbox
  - url: 'https://git.kernel.org/stable/c/2d1e7c5aaa3326e95e2058457f172ca99a9a4577'
  - url: 'https://git.kernel.org/stable/c/486c699a8cde82c1d9b4f443eeab4ddf86358cb0'
  - url: 'https://git.kernel.org/stable/c/5e5d9e6df677d30a2203d257b5fd8b99814fa607'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00649
epssPercentile: 0.48887
scores:
  vendor: 4.1
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

A flaw was found in the Linux kernel's SMC-Rv2 network component. A remote attacker could exploit this vulnerability by sending a specially crafted message during an SMC-Rv2 link addition. This can lead to a slab-out-of-bounds write, potentially causing a system crash and resulting in a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80986.json)

**kernel: net/smc: bound the peer rkey counts in SMC-Rv2 LLC messages** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

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

## Remediation

Affected