---
id: CVE-2026-80987
title: 'NTB: ntb_transport: Reject oversized TX buffers'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NTB: ntb_transport: Reject oversized TX buffers

  ntb_process_tx() handles an oversized buffer by calling tx_handler()
  with a NULL data pointer and returning success. nt…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-772
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    4890152a3069f5cb58cc24b08cfd5fe95e568fa1
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    668aa3238548584ca9772da9cf43ae8c2389bbf1
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    9b0fa8a9e1057614a533cc3f18b17f82aab028d8
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    a7f22105a7df8c7fd74d0af27ace6fa94fe03d87
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    6b6bbc6c878d64eacc60877df49fce7b1b6a08d0
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    75a604e9f1cfdebda421062fdf42225ca32154cd
  - >-
    Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 <
    a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7
  - Linux 3.9
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T19:21:52.922531Z'
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:11.577Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80987'
references:
  - 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'
  - 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
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00501
epssPercentile: 0.42712
scores:
  cna: 7.5
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

NTB: ntb_transport: Reject oversized TX buffers

ntb_process_tx() handles an oversized buffer by calling tx_handler()
with a NULL data pointer and returning success. ntb_netdev therefore
neither frees the skb in its completion callback nor takes its enqueue
error path, leaking it.

Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring
a queue entry and return -EMSGSIZE. The caller retains ownership of the
buffer, and the preceding netdev patch frees the skb when enqueue
returns this permanent error.

## Affected

- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < 4890152a3069f5cb58cc24b08cfd5fe95e568fa1`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < 668aa3238548584ca9772da9cf43ae8c2389bbf1`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < 9b0fa8a9e1057614a533cc3f18b17f82aab028d8`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < a7f22105a7df8c7fd74d0af27ace6fa94fe03d87`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < 75a604e9f1cfdebda421062fdf42225ca32154cd`
- `Linux >= fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 < a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7`
- `Linux 3.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)