---
id: CVE-2026-23154
title: 'net: fix segmentation of forwarding fraglist GRO'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: fix segmentation of forwarding fraglist GRO

  This patch enhances GSO segment handling by properly checking
  the SKB_GSO_DODGY flag for frag_list GSO packets, addres…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 <
    9122d7280b2303e835cdfec156bd932ac1f586ed
  - >-
    Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 <
    2cbef9ea5a0ac51863ede35c45f26931a85d3888
  - >-
    Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 <
    3e62db1e3140449608975e29e0979cc5f3b1cc07
  - >-
    Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 <
    3d48d59235c494d34e32052f768393111c0806ef
  - >-
    Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 <
    426ca15c7f6cb6562a081341ca88893a50c59fa2
  - Linux 5.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:41:02.301817Z'
published: '2026-02-14'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:45:02.027Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23154'
references:
  - url: 'https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed'
  - url: 'https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888'
  - url: 'https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07'
  - url: 'https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef'
  - url: 'https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2'
tags:
  - cve.org
epss: 0.00119
epssPercentile: 0.01573
ingestedAt: '2026-09-08T15:33:26.993Z'
---

## Overview

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

net: fix segmentation of forwarding fraglist GRO

This patch enhances GSO segment handling by properly checking
the SKB_GSO_DODGY flag for frag_list GSO packets, addressing
low throughput issues observed when a station accesses IPv4
servers via hotspots with an IPv6-only upstream interface.

Specifically, it fixes a bug in GSO segmentation when forwarding
GRO packets containing a frag_list. The function skb_segment_list
cannot correctly process GRO skbs that have been converted by XLAT,
since XLAT only translates the header of the head skb. Consequently,
skbs in the frag_list may remain untranslated, resulting in protocol
inconsistencies and reduced throughput.

To address this, the patch explicitly sets the SKB_GSO_DODGY flag
for GSO packets in XLAT's IPv4/IPv6 protocol translation helpers
(bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO
packets as potentially modified after protocol translation. As a
result, GSO segmentation will avoid using skb_segment_list and
instead falls back to skb_segment for packets with the SKB_GSO_DODGY
flag. This ensures that only safe and fully translated frag_list
packets are processed by skb_segment_list, resolving protocol
inconsistencies and improving throughput when forwarding GRO packets
converted by XLAT.

## Affected

- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 9122d7280b2303e835cdfec156bd932ac1f586ed`
- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 2cbef9ea5a0ac51863ede35c45f26931a85d3888`
- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 3e62db1e3140449608975e29e0979cc5f3b1cc07`
- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 3d48d59235c494d34e32052f768393111c0806ef`
- `Linux >= 9fd1ff5d2ac7181844735806b0a703c942365291 < 426ca15c7f6cb6562a081341ca88893a50c59fa2`
- `Linux 5.6`

## Remediation

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