---
id: CVE-2026-97417
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()

  The timestamp-only fast path dereferences the option stream as
  *(__be32 *)ptr, which assumes 4-byte ali…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()

  The timestamp-only fast path dereferences the option stream as
  *(__be32 *)ptr, which assumes 4-byte ali…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    7ecfa46a536578a7ed335ddf31a854127268c27c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    4abc1af7ac209c066f4e5dd75cdd56876e5829a9
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    d3bf9eae486490832bd08fd62ab0ac601f346bd4
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:17:25.243'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97417'
references:
  - url: 'https://git.kernel.org/stable/c/4abc1af7ac209c066f4e5dd75cdd56876e5829a9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7ecfa46a536578a7ed335ddf31a854127268c27c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d3bf9eae486490832bd08fd62ab0ac601f346bd4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97417.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97417'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540479'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97417'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97417'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97417.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-24T16:47:15.885Z'
cwe:
  - CWE-843
epss: 0.00426
epssPercentile: 0.34351
---

## Overview

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

netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()

The timestamp-only fast path dereferences the option stream as
*(__be32 *)ptr, which assumes 4-byte alignment that the TCP option
stream does not guarantee. Use get_unaligned_be32() instead, which
reads the value safely and already returns host byte order, so the
htonl() on the comparison constant can be dropped.

This matches the existing get_unaligned_be32() use later in the same
function.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97417.json)