Out-of-bounds read in Linux kernel VXLAN vxlan_na_create
CVE-2026-31738 is a Linux kernel vulnerability in the VXLAN subsystem, specifically in vxlan_na_create(), which parses IPv6 Neighbor Discovery (ND) options while constructing a Neighbor Advertisement. The function walks ND options using attacker-controlled option length fields. If a malformed ND option is supplied, the parser can advance beyond the computed ND option span or attempt to consume a source link-layer address (LLADDR) option whose payload is too short for an Ethernet address. The fix adds validation that each option length fits within the remaining Neighbor Solicitation option area before advancing the parser, and ensures the source LLADDR is only read when the option is large enough. Based on the available description, this is a bounds-checking failure leading to out-of-bounds memory access during ND option parsing in VXLAN.
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