Out-of-bounds write in IPv6 6LoWPAN Context Option handling via unauthenticated Router Advertisement
The IPv6 neighbor-discovery code in subsys/net/ip/ipv6_nbr.c processes the 6LoWPAN Context Option (6CO, RFC 6775) carried inside ICMPv6 Router Advertisements. In handle_ra_6co() the 8-bit context_len field is taken directly from the packet and was never bounded to the RFC maximum of 128. The function computes context->…
Severity high: primary CNA CVSS 8.1 v3.1 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-08-19T20:37:34.532Z. Updated 2026-08-20T15:26:33.782Z.