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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-30

Description

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().

Affected products

• Linux: 3.12 — fixed in 7.2

How to fix

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

References

• https://git.kernel.org/stable/c/2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4
• https://git.kernel.org/stable/c/5c9c67cf7a3d16051dfb90e98836f530964dfb8e
• https://git.kernel.org/stable/c/95cda0446f51077c343fdd8264be2737eb25a6c3
• https://git.kernel.org/stable/c/992c20bc8a4aba220c8b95b467d049289778dad6
• https://git.kernel.org/stable/c/b30a2d56ee47282f6a46cb2f50e315b2414851fe
• https://git.kernel.org/stable/c/ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7

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