High 7.5Published Aug 28, 2026

CVE-2026-80637netfilter: synproxy: fix unaligned memory access in timestamp adjustment

Updated under an hour ago (Oct 28, 2026, 12:00 AM ET)

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Exploited in the last 30 days

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().

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 48b1de4c110a7afa4b85862f6c75af817db26fad before 95cda0446f51077c343fdd8264be2737eb25a6c3; 48b1de4c110a7afa4b85862f6c75af817db26fad builds before 2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4; 48b1de4c110a7afa4b85862f6c75af817db26fad builds before 5c9c67cf7a3d16051dfb90e98836f530964dfb8e; from 48b1de4c110a7afa4b85862f6c75af817db26fad before ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7; from 48b1de4c110a7afa4b85862f6c75af817db26fad before 992c20bc8a4aba220c8b95b467d049289778dad6	CNA record

References

References

https://git.kernel.org/stable/c/95cda0446f51077c343fdd8264be2737eb25a6c3
https://git.kernel.org/stable/c/2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4
https://git.kernel.org/stable/c/5c9c67cf7a3d16051dfb90e98836f530964dfb8e
https://git.kernel.org/stable/c/ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7
https://git.kernel.org/stable/c/992c20bc8a4aba220c8b95b467d049289778dad6

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.