---
id: CVE-2026-98096
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: sr: restore network header before routing and forwarding

  ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH)
  while skb_network_header() points…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: sr: restore network header before routing and forwarding

  ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH)
  while skb_network_header() points…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1ababeba4a21f3dba3da3523c670b207fb2feb62 <
    ce4c8beedc19aceeab0e7bdc6f34394fb158c47c
  - >-
    Linux >= 1ababeba4a21f3dba3da3523c670b207fb2feb62 <
    97b21ef57dfabbff660a4672c9fef7edfb720f47
  - >-
    Linux >= 1ababeba4a21f3dba3da3523c670b207fb2feb62 <
    3ad7dca5e03bd64c65983a19734337512fd75491
  - >-
    Linux >= 1ababeba4a21f3dba3da3523c670b207fb2feb62 <
    975b5b067f525a1b1338c4a3bee1c46545801518
  - Linux 4.10
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T15:18:05.827'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98096'
references:
  - url: 'https://git.kernel.org/stable/c/3ad7dca5e03bd64c65983a19734337512fd75491'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/975b5b067f525a1b1338c4a3bee1c46545801518'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/97b21ef57dfabbff660a4672c9fef7edfb720f47'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ce4c8beedc19aceeab0e7bdc6f34394fb158c47c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.829Z'
---

## Overview

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

ipv6: sr: restore network header before routing and forwarding

ipv6_srh_rcv() runs with skb->data at the Segment Routing Header (SRH)
while skb_network_header() points at the IPv6 header.

When segments_left > 0, ipv6_srh_rcv() previously restored the skb->data
position by pushing sizeof(struct ipv6hdr), assuming the SRH immediately
followed the fixed IPv6 header. If another extension header (such as a
Hop-by-Hop options header) precedes the SRH, skb_network_offset()
remained negative.

This led to two problems:
1. During ip6_route_input(), fib6_rules_early_flow_dissect() invokes
   __skb_flow_dissect() which passes the negative skb_network_offset()
   to flow dissection, breaking BPF and C flow dissector logic.
2. If forwarded via ip6_forward() or redirected via act_mirred, downstream
   handlers (like sch_fragment() or neighbour output) pass the negative
   offset as an unsigned length, triggering OOB memcpy or buffer overflows.

Fix this by pushing -skb_network_offset(skb) before routing, ensuring
skb_network_offset(skb) is 0 for route lookup / flow dissection as well as
downstream forwarding. On the loopback path, pull skb_transport_offset(skb)
to restore skb->data to the SRH before looping back.

## Remediation

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