High 7.5Published Sep 24, 2026

CVE-2026-97417netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()

Updated under an hour ago (Oct 27, 2026, 4:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

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 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before 740ad3d17a281f7764dda4dbeb37cea52e2e31ae; from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before a0523267de2523522b0f70972dd1ffa22ec6176c; from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before 55bcc3376cd7b18954cc9814da697504fdaf12bf; from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before 0d5ad732e4fdc569eb85861115e8f7b4c2c67852; from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before 7ecfa46a536578a7ed335ddf31a854127268c27c; from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before 4abc1af7ac209c066f4e5dd75cdd56876e5829a9; from bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9 before d3bf9eae486490832bd08fd62ab0ac601f346bd4	CNA record

References

References

https://git.kernel.org/stable/c/740ad3d17a281f7764dda4dbeb37cea52e2e31ae
https://git.kernel.org/stable/c/a0523267de2523522b0f70972dd1ffa22ec6176c
https://git.kernel.org/stable/c/55bcc3376cd7b18954cc9814da697504fdaf12bf
https://git.kernel.org/stable/c/0d5ad732e4fdc569eb85861115e8f7b4c2c67852
https://git.kernel.org/stable/c/7ecfa46a536578a7ed335ddf31a854127268c27c
https://git.kernel.org/stable/c/4abc1af7ac209c066f4e5dd75cdd56876e5829a9
https://git.kernel.org/stable/c/d3bf9eae486490832bd08fd62ab0ac601f346bd4

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.