---
id: CVE-2026-72114
title: 'can: bcm: validate frame length in bcm_rx_setup() for RTR replies'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  can: bcm: validate frame length in bcm_rx_setup() for RTR replies

  bcm_tx_setup() validates cf->len against the CAN/CAN FD DLC limits
  before installing frames for TX_SE…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    204f2b232717bc470ddb9e1da1d27dd9c6ef0caa
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    e061624c0a86c3c26a2bf017e432fbc93ad68f3a
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    7d966cdee006911d3957e1a4e72cb93c39cd8c1e
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    1b475c0c72f44622a320a4386ce9e76f85e69bc7
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    deb6a697cce3f021e731df543597f37a5e54caab
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    59bfddea64159594feb62ef11b7d7a33c8ee3783
  - >-
    Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 <
    62ec41f364648be79d54d94d0d240ee326948afd
  - Linux 2.6.25
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:41:46.302799Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:44:56.572Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72114'
references:
  - url: 'https://git.kernel.org/stable/c/cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce'
  - url: 'https://git.kernel.org/stable/c/204f2b232717bc470ddb9e1da1d27dd9c6ef0caa'
  - url: 'https://git.kernel.org/stable/c/e061624c0a86c3c26a2bf017e432fbc93ad68f3a'
  - url: 'https://git.kernel.org/stable/c/7d966cdee006911d3957e1a4e72cb93c39cd8c1e'
  - url: 'https://git.kernel.org/stable/c/1b475c0c72f44622a320a4386ce9e76f85e69bc7'
  - url: 'https://git.kernel.org/stable/c/deb6a697cce3f021e731df543597f37a5e54caab'
  - url: 'https://git.kernel.org/stable/c/59bfddea64159594feb62ef11b7d7a33c8ee3783'
  - url: 'https://git.kernel.org/stable/c/62ec41f364648be79d54d94d0d240ee326948afd'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05785
ingestedAt: '2026-10-16T19:46:24.432Z'
---

## Overview

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

can: bcm: validate frame length in bcm_rx_setup() for RTR replies

bcm_tx_setup() validates cf->len against the CAN/CAN FD DLC limits
before installing frames for TX_SETUP, but bcm_rx_setup() never did
the same for the RTR-reply frame configured via RX_SETUP with
RX_RTR_FRAME.

## Affected

- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < cc1f9569f1c1adf74fa69d6f716a31b58a2fc6ce`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 204f2b232717bc470ddb9e1da1d27dd9c6ef0caa`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < e061624c0a86c3c26a2bf017e432fbc93ad68f3a`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 7d966cdee006911d3957e1a4e72cb93c39cd8c1e`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 1b475c0c72f44622a320a4386ce9e76f85e69bc7`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < deb6a697cce3f021e731df543597f37a5e54caab`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 59bfddea64159594feb62ef11b7d7a33c8ee3783`
- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 62ec41f364648be79d54d94d0d240ee326948afd`
- `Linux 2.6.25`

## Remediation

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