---
id: CVE-2026-97614
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: dsa: tag_brcm: legacy FCS: request needed tailroom

  The legacy FCS tagger calculates the CRC over skb->len bytes starting at
  skb->data
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: dsa: tag_brcm: legacy FCS: request needed tailroom

  The legacy FCS tagger calculates the CRC over skb->len bytes starting at
  skb->data. When a nonlinear skb reache…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ef07df397a621707903ef0d294a7df11f80cf206 <
    709451db123d90743fa9104b48f324a8e49f8c6f
  - >-
    Linux >= ef07df397a621707903ef0d294a7df11f80cf206 <
    3eb5c7e1c154c74568620a25c6751bb8d6d8d728
  - >-
    Linux >= ef07df397a621707903ef0d294a7df11f80cf206 <
    5be081b83abd3f17d908953b4bb77279f5a149e3
  - Linux 6.17
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:15.563'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97614'
references:
  - url: 'https://git.kernel.org/stable/c/3eb5c7e1c154c74568620a25c6751bb8d6d8d728'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5be081b83abd3f17d908953b4bb77279f5a149e3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/709451db123d90743fa9104b48f324a8e49f8c6f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97614.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97614'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541150'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97614'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97614'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97614.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-25T11:06:38.898Z'
epss: 0.00198
epssPercentile: 0.09467
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-125
---

## Overview

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

net: dsa: tag_brcm: legacy FCS: request needed tailroom

The legacy FCS tagger calculates the CRC over skb->len bytes starting at
skb->data. When a nonlinear skb reaches the tagger, this reads past the
linear head into unrelated slab memory.

The tagger appends an Ethernet FCS but does not declare that tailroom. As a
result, DSA leaves NETIF_F_SG and NETIF_F_FRAGLIST enabled on the user
port, and nonlinear skbs can reach the CRC calculation.

Declare the required tailroom. DSA will then clear those features and the
networking core will linearize skbs before the tagger runs.

A KASAN-enabled dsa_loop test using this tagger reports:

  BUG: KASAN: slab-out-of-bounds in crc32_le
  Read of size 1 at addr ffff8880397086c0 by task exp/135

  Call Trace:
   crc32_le (lib/crc/crc32-main.c:38)
   brcm_leg_fcs_tag_xmit (net/dsa/tag_brcm.c:343)
   dsa_user_xmit (net/dsa/user.c:942)
   dev_hard_start_xmit (net/core/dev.c:3937)
   __dev_queue_xmit (net/core/dev.c:4926)
   packet_sendmsg (net/packet/af_packet.c:3110)
   __sys_sendto (net/socket.c:2281)

  The buggy address belongs to the object at ffff888039708400
   which belongs to the cache skbuff_small_head of size 704
  The buggy address is located 0 bytes to the right of
   allocated 704-byte region [ffff888039708400, ffff8880397086c0)

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97614.json)