CVE-2026-80637 PUBLISHED

netfilter: synproxy: fix unaligned memory access in timestamp adjustment

Assigner: Linux
Reserved: 26.08.2026 Published: 28.08.2026 Updated: 28.08.2026

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().

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 48b1de4c110a7afa4b85862f6c75af817db26fad to 2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4 (excl.)
  • affected from 48b1de4c110a7afa4b85862f6c75af817db26fad to 5c9c67cf7a3d16051dfb90e98836f530964dfb8e (excl.)
  • affected from 48b1de4c110a7afa4b85862f6c75af817db26fad to ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7 (excl.)
  • affected from 48b1de4c110a7afa4b85862f6c75af817db26fad to 992c20bc8a4aba220c8b95b467d049289778dad6 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 3.12 is affected
  • unaffected from 0 to 3.12 (excl.)
  • unaffected from 6.12.97 to 6.12.* (incl.)
  • unaffected from 6.18.40 to 6.18.* (incl.)
  • unaffected from 7.1.5 to 7.1.* (incl.)
  • unaffected from 7.2 to * (incl.)

References