What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-03

Description

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.

Affected products

• Linux kernel: 3.1 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

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

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