---
id: CVE-2026-80987
title: 'kernel: NTB: ntb_transport: Reject oversized TX buffers (CVE-2026-80987)'
summary: >-
  A flaw was found in the Linux kernel's Non-Transparent Bridge (NTB) transport
  module. When processing oversized transmit (TX) buffers, the system fails to
  properly free the allocated memory, leading to a memory leak. This continuous
  leakag…
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-772
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:49:51+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80987.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80987.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80987'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532223'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80987'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80987'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80987.mbox
  - url: 'https://git.kernel.org/stable/c/4890152a3069f5cb58cc24b08cfd5fe95e568fa1'
  - url: 'https://git.kernel.org/stable/c/668aa3238548584ca9772da9cf43ae8c2389bbf1'
  - url: 'https://git.kernel.org/stable/c/9b0fa8a9e1057614a533cc3f18b17f82aab028d8'
  - url: 'https://git.kernel.org/stable/c/b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88'
  - url: 'https://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87'
  - url: 'https://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0'
  - url: 'https://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd'
  - url: 'https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00508
epssPercentile: 0.42396
scores:
  vendor: 5.5
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

A flaw was found in the Linux kernel's Non-Transparent Bridge (NTB) transport module. When processing oversized transmit (TX) buffers, the system fails to properly free the allocated memory, leading to a memory leak. This continuous leakage of memory could eventually exhaust system resources, resulting in a Denial of Service (DoS) for affected systems.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80987.json)

**kernel: NTB: ntb_transport: Reject oversized TX buffers** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

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

No fix planned:

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

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Fix deferred