---
id: CVE-2026-80637
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: synproxy: fix unaligned memory access in timestamp adjustment

  Use get_unaligned_be32() and put_unaligned_be32() to safely read and
  write the timestamp field…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: synproxy: fix unaligned memory access in timestamp adjustment

  Use get_unaligned_be32() and put_unaligned_be32() to safely read and
  write the timestamp field…
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'
published: '2026-08-28'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80637'
references:
  - url: 'https://git.kernel.org/stable/c/2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5c9c67cf7a3d16051dfb90e98836f530964dfb8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/992c20bc8a4aba220c8b95b467d049289778dad6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.0063
epssPercentile: 0.48051
ingestedAt: '2026-08-30T03:46:31.135Z'
---

## Overview

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

netfilter: synproxy: fix unaligned memory access in timestamp adjustment

Use get_unaligned_be32() and put_unaligned_be32() to safely read and
write the timestamp fields. This prevents performance degradation due to
unaligned memory access or even a crash on strict alignment
architectures.

This follows the implementation of timestamp parsing in the networking
stack at tcp_parse_options() and synproxy_parse_options().

## Remediation

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