CVE-2026-80637
Received Received - Intake

Unaligned Memory Access in Linux Kernel Netfilter Synproxy

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: kernel.org

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().

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-28
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-80637
EUVD
EUVD-2026-67513

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper handling of unaligned memory access when adjusting timestamps in the netfilter synproxy component. The issue is fixed by using get_unaligned_be32() and put_unaligned_be32() functions to safely read and write timestamp fields, preventing crashes or performance issues on architectures that enforce strict memory alignment.

Impact Analysis

This vulnerability could cause system crashes or performance degradation on Linux systems using the netfilter synproxy feature, particularly on architectures requiring strict memory alignment. It may lead to network service disruptions or instability in affected systems.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the unaligned memory access issue in the synproxy timestamp handling.

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