this post was submitted on 21 Jun 2026
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OpenBSD - Remote Kernel MPLS Stack Disclosure (pop.argus-systems.ai)
submitted 1 week ago by cm0002@mander.xyz to c/openbsd
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mpls_do_error copies (nstk+1) label-stack entries from a fixed 16-entry array when no BoS label is present, leaking 4 bytes of adjacent kernel stack memory in the ICMP/MPLS error response.

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