---
id: CVE-2026-80875
title: 'ipvs: use parsed transport offset in TCP state lookup'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipvs: use parsed transport offset in TCP state lookup

  TCP state handling reparses the skb to find the TCP header. For IPv6 it
  uses sizeof(struct ipv6hdr), while the su…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    2d06e0897ce18228d199887f0823b431d841dd03
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    816efb7fc0aeae986e63ac73b428dd97a4ef69f5
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    5848e914b85e360a2dd9d19c00a72e2ea9617dd0
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    d45f73c274435703e8d7bc9d8b742a5d9111ab6e
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    f6f550f26562d191c30b2818e7925dcb1c7f166c
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    d73f4249776dd970ad65a69cfc51613dd8a034bb
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    c2ee845e292c278fac75bf28d96bc892607fd5c4
  - >-
    Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d <
    2500fa3958b1ba51c2b065e39db1b04dfa7e23a2
  - Linux 2.6.28
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T17:04:00.127070Z'
published: '2026-09-04'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:05:55.382Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80875'
references:
  - url: 'https://git.kernel.org/stable/c/2d06e0897ce18228d199887f0823b431d841dd03'
  - url: 'https://git.kernel.org/stable/c/816efb7fc0aeae986e63ac73b428dd97a4ef69f5'
  - url: 'https://git.kernel.org/stable/c/5848e914b85e360a2dd9d19c00a72e2ea9617dd0'
  - url: 'https://git.kernel.org/stable/c/d45f73c274435703e8d7bc9d8b742a5d9111ab6e'
  - url: 'https://git.kernel.org/stable/c/f6f550f26562d191c30b2818e7925dcb1c7f166c'
  - url: 'https://git.kernel.org/stable/c/d73f4249776dd970ad65a69cfc51613dd8a034bb'
  - url: 'https://git.kernel.org/stable/c/c2ee845e292c278fac75bf28d96bc892607fd5c4'
  - url: 'https://git.kernel.org/stable/c/2500fa3958b1ba51c2b065e39db1b04dfa7e23a2'
tags:
  - cve.org
epss: 0.0022
epssPercentile: 0.12546
ingestedAt: '2026-11-06T18:00:12.532Z'
---

## Overview

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

ipvs: use parsed transport offset in TCP state lookup

TCP state handling reparses the skb to find the TCP header. For IPv6 it
uses sizeof(struct ipv6hdr), while the surrounding IPVS code already
parsed the packet with ip_vs_fill_iph_skb() and has the real
transport-header offset in iph.len.

This makes TCP state handling look at the wrong bytes when an IPv6
packet carries extension headers. Use the parsed transport offset passed
down from ip_vs_set_state() when reading the TCP header.

For IPv4 and for IPv6 packets without extension headers, the passed
offset matches the previous value.

## Affected

- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < 2d06e0897ce18228d199887f0823b431d841dd03`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < 816efb7fc0aeae986e63ac73b428dd97a4ef69f5`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < 5848e914b85e360a2dd9d19c00a72e2ea9617dd0`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < d45f73c274435703e8d7bc9d8b742a5d9111ab6e`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < f6f550f26562d191c30b2818e7925dcb1c7f166c`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < d73f4249776dd970ad65a69cfc51613dd8a034bb`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < c2ee845e292c278fac75bf28d96bc892607fd5c4`
- `Linux >= 0bbdd42b7efa66685b6d74701bcde3a596a3a59d < 2500fa3958b1ba51c2b065e39db1b04dfa7e23a2`
- `Linux 2.6.28`

## Remediation

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