{"id":"CVE-2026-115403","kind":"vulnerability","aliases":["CVE-2026-115403"],"related":[],"title":"Eclipse ThreadX NetX Duo: IPv6 raw send NULL pointer crash","description":"In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, built with BSD raw socket and IPv6 support, the IPv6 raw send path uses the destination-table entry it adds without checking that the add succeeded. When the destination table is full and an off-link destination is reached through a default router whose neighbour cache entry is unknown, sending on an IPv6 raw socket with header inclusion dereferences a NULL pointer; a remote sender can fill the table, for example with ICMPv6 Packet Too Big messages, and crash the sending thread.","summary":"Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, built with BSD raw socket and IPv6 support, do not check whether a destination-table add succeeded. A remote sender who fills the table, for example with ICMPv6 Packet Too Big messages, can trigger a NULL pointer dereference that crashes the sending thread.","severity":"high","cvss":8.2,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"netxduo","fixed":["6.5.2.202603b"],"affected":">= 6.0, <= 6.5.2.202603a","ecosystem":"vendor"}],"ecosystems":[],"tags":["embedded","ipv6","netx-duo","runtime","threadx"],"not_affected_if":["ipv6-disabled","no-raw-sockets"],"how_to_check":"- Check whether your NetX Duo version is between 6.0 and 6.5.2.202603a (fixed in 6.5.2.202603b).\n- Check that the build defines NX_BSD_RAW_SUPPORT with IPv6 enabled, and that the app sends raw IPv6 packets with IP_RAW_IPV6_HDRINCL to off-link destinations.\n- Workarounds: avoid IP_RAW_IPV6_HDRINCL sends to off-link destinations; build without NX_BSD_RAW_SUPPORT; raising NX_IPV6_DESTINATION_TABLE_SIZE only makes it harder to trigger, not a fix.","fix":"Upgrade NetX Duo to 6.5.2.202603b","status":"open","published_at":"2026-11-02T22:17:18+00:00","first_seen_at":"2026-11-02T22:35:43+00:00","triaged_at":"2026-11-02T22:37:47+00:00","updated_at":"2026-11-02T22:38:48+00:00","category":"runtime","confidence":0.85,"triage":{"at":"2026-11-02T22:37:47Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Eclipse ThreadX NetX Duo: IPv6 raw send NULL pointer crash","impact":"low","summary":"Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, built with BSD raw socket and IPv6 support, do not check whether a destination-table add succeeded. A remote sender who fills the table, for example with ICMPv6 Packet Too Big messages, can trigger a NULL pointer dereference that crashes the sending thread.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["threadx","netx-duo","embedded","ipv6"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Sending thread crashes, causing a denial of service on the device","analyst_note":"Find the fixed version and affected product list in the Eclipse ThreadX vendor advisory linked from the sources.","how_to_check":"- Check whether the ThreadX NetX Duo version is between `6.0` and `6.5.2.202603a`\n- Check whether the build enables BSD raw sockets and IPv6 support\n- unknown for other checks, as the sources do not say","plain_action":"","needs_analyst":true,"not_affected_if":["ipv6-disabled","no-raw-sockets"],"who_is_affected":"Only devices running embedded ThreadX NetX Duo with IPv6 and BSD raw socket support built in are exposed, and the crash needs an off-link destination reached through a default router. unknown for further detail, as the sources do not say which products ship this build.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000723,"input_tokens":4254,"output_tokens":596,"severity_before":"high"},"analyst_status":"done","analyst_note":"Find the fixed version and affected product list in the Eclipse ThreadX vendor advisory linked from the sources.","search":"'-115403':13A,16A '-2026':12A,15A '6.0':30B,84C '6.5.2.202603':32B,86C 'add':50B,108C,113C 'big':65B,165C 'bsd':36B,90C 'built':34B,88C 'cach':135C 'check':44B,110C 'crash':10A,74B,168C 'cve':11A,14A 'default':131C 'derefer':72B,148C 'destin':48B,104C,117C,126C 'destination-t':47B,103C 'duo':4A,22B,28B,82C 'eclips':1A,25B,79C 'embed':18B 'entri':106C,136C 'exampl':60B,160C 'fill':56B,156C 'full':120C 'header':146C 'icmpv6':62B,162C 'inclus':147C 'ipv6':5A,19B,40B,94C,97C,142C 'link':125C 'messag':66B,166C 'neighbour':134C 'netx':3A,21B,27B,81C 'netx-duo':20B 'netxduo':17A 'null':8A,70B,150C 'off-link':123C 'packet':63B,163C 'path':100C 'pointer':9A,71B,151C 'raw':6A,37B,91C,98C,143C 'reach':128C 'remot':53B,153C 'router':132C 'runtim':23B 'send':7A,76B,99C,139C,170C 'sender':54B,154C 'socket':38B,92C,144C 'succeed':51B,114C 'support':41B,95C 'tabl':49B,58B,105C,118C,158C 'thread':77B,171C 'threadx':2A,24B,26B,80C 'trigger':68B 'unknown':138C 'use':101C 'version':29B,83C 'whether':45B 'whose':133C 'without':109C","nicknames":[],"mitigations":[],"who_affected":"Devices running Eclipse ThreadX NetX Duo 6.0 through 6.5.2.202603a built with NX_BSD_RAW_SUPPORT and IPv6, whose app sends raw IPv6 packets with header inclusion to off-link destinations through a default router. The destination table can fill from the device's own traffic or from ICMPv6 Packet Too Big messages when path MTU discovery is on; the sending thread then crashes. Others can skip it.","tier":"B","verified":{"fix":{"at":"2026-11-02T22:38:48Z","by":"analyst","doc":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9w9h-x3fh-m3fp","run_id":1437},"products":{"at":"2026-11-02T22:38:48Z","by":"analyst","doc":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9w9h-x3fh-m3fp","run_id":1437},"workarounds":{"at":"2026-11-02T22:38:48Z","by":"analyst","doc":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9w9h-x3fh-m3fp","run_id":1437},"how_to_check":{"at":"2026-11-02T22:38:48Z","by":"analyst","doc":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9w9h-x3fh-m3fp","run_id":1437},"who_affected":{"at":"2026-11-02T22:38:48Z","by":"analyst","doc":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9w9h-x3fh-m3fp","run_id":1437}},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["netxduo"],"ptokens":["netxduo"],"labels":["embedded","high","ipv6","netxduo","runtime","threadx"],"first_public_at":"2026-11-01T17:32:33+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"emo@eclipse.org","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-115403","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115403","severity":null,"published_at":"2026-11-02T22:17:18+00:00","modified_at":"2026-11-02T22:17:18+00:00","first_seen_at":"2026-11-02T22:35:43+00:00","fetched_at":"2026-11-02T22:35:43+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-115403:1437","url":null,"severity":null,"published_at":"2026-11-02T22:38:48+00:00","modified_at":"2026-11-02T22:38:48+00:00","first_seen_at":"2026-11-02T22:38:48+00:00","fetched_at":"2026-11-02T22:38:48+00:00","note":"Read vendor GHSA via WebFetch (web-cli returned empty): affected >=6.0 <=6.5.2.202603a, fixed 6.5.2.202603b, workarounds listed. X not checked. No exploitation/PoC seen."}],"documents":[{"id":54165,"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9w9h-x3fh-m3fp","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-01T17:32:33+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}