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synproxy

About this tag
The synproxy tag on WindowsForum.com covers discussions about the SYNPROXY stateful object within the Linux kernel's netfilter nftables subsystem. Content under this tag includes analysis of a vulnerability (CVE-2025-40206) where improper validation of objref and objrefmap expressions referencing a synproxy object from the OUTPUT hook could cause infinite recursion and a kernel crash. The fix adds proper validation to prevent such crashes. This tag is relevant for Linux system administrators, security researchers, and IT professionals interested in kernel networking, firewall rules, and stability issues related to nftables and SYNPROXY.
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    CVE-2025-40206: nftables objref Validation Fix Prevents OUTPUT Recursion Crash (Linux Kernel)

    A recently disclosed Linux-kernel vulnerability in the netfilter nftables subsystem can cause a kernel crash when a rule references certain stateful objects from the OUTPUT hook; maintainers fixed the defect by adding proper validation for objref and objrefmap expressions so that referencing a...
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