---
id: CVE-2026-53088
title: 'net: bcmgenet: fix off-by-one in bcmgenet_put_txcb'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: bcmgenet: fix off-by-one in bcmgenet_put_txcb

  The write_ptr points to the next open tx_cb. We want to return the
  tx_cb that gets rewinded, so we must rewind the p…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    14e9f86564fff7bcf7f45c1b69080e837b31d185
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    fb9a3c1f547d0ff024dbfe7b6f327626ddf0a3de
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    85f34ec320d3881badfd4edc5fee5cd5012bb54d
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    2a74590170427a3ca7cc4bb8690cdd559129c29c
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    29394f722f620281f2ee9a47f947734e53d72c90
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    4cab761fc51c65aef741fcece4a18f3554edbc09
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    72df896e31ddd06fcc5a789f025ad7a62a18bc9b
  - >-
    Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 <
    57f3f53d2c9c5a9e133596e2f7bc1c50688a6d38
  - Linux 3bdf77194ea822390b405639b77659071fd2c2e9
  - Linux >= 3.16.50 < 3.17
  - Linux 4.13
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T15:25:29.702977Z'
published: '2026-06-24'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:31:31.972Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53088'
references:
  - url: 'https://git.kernel.org/stable/c/14e9f86564fff7bcf7f45c1b69080e837b31d185'
  - url: 'https://git.kernel.org/stable/c/fb9a3c1f547d0ff024dbfe7b6f327626ddf0a3de'
  - url: 'https://git.kernel.org/stable/c/85f34ec320d3881badfd4edc5fee5cd5012bb54d'
  - url: 'https://git.kernel.org/stable/c/2a74590170427a3ca7cc4bb8690cdd559129c29c'
  - url: 'https://git.kernel.org/stable/c/29394f722f620281f2ee9a47f947734e53d72c90'
  - url: 'https://git.kernel.org/stable/c/4cab761fc51c65aef741fcece4a18f3554edbc09'
  - url: 'https://git.kernel.org/stable/c/72df896e31ddd06fcc5a789f025ad7a62a18bc9b'
  - url: 'https://git.kernel.org/stable/c/57f3f53d2c9c5a9e133596e2f7bc1c50688a6d38'
tags:
  - cve.org
epss: 0.00399
epssPercentile: 0.32547
ingestedAt: '2026-10-16T17:24:46.730Z'
---

## Overview

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

net: bcmgenet: fix off-by-one in bcmgenet_put_txcb

The write_ptr points to the next open tx_cb. We want to return the
tx_cb that gets rewinded, so we must rewind the pointer first then
return the tx_cb that it points to. That way the txcb can be correctly
cleaned up.

## Affected

- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 14e9f86564fff7bcf7f45c1b69080e837b31d185`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < fb9a3c1f547d0ff024dbfe7b6f327626ddf0a3de`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 85f34ec320d3881badfd4edc5fee5cd5012bb54d`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 2a74590170427a3ca7cc4bb8690cdd559129c29c`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 29394f722f620281f2ee9a47f947734e53d72c90`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 4cab761fc51c65aef741fcece4a18f3554edbc09`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 72df896e31ddd06fcc5a789f025ad7a62a18bc9b`
- `Linux >= 876dbadd53a7102e2a84afc84ea2bd3ee6dc5636 < 57f3f53d2c9c5a9e133596e2f7bc1c50688a6d38`
- `Linux 3bdf77194ea822390b405639b77659071fd2c2e9`
- `Linux >= 3.16.50 < 3.17`
- `Linux 4.13`

## Remediation

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