CVE-2026-65200 — Huawei malicious on-bus PLDM or NCSI device can drive out-of-bounds-heap reads via short MCTP responses
The openUBMC device-management process parses PLDM-over-MCTP and NCSI-over-MCTP responses from on-bus devices, and three response parsers in the shared transport libraries subtr…
Published: 2026-10-13 · CVSS: 3.5 · CVSS 3.1
The openUBMC device-management process parses PLDM-over-MCTP and NCSI-over-MCTP responses from on-bus devices, and three response parsers in the shared transport libraries subtract a fixed header or reserved-field size from a device-supplied response length without a lower-bound check. An undersized response wraps the unsigned length difference to a very large value, and the parser then reads far past the response buffer. The affected code sits in the base (non-vendor) PLDM control class and the Huawei NCSI driver, so it is reachable for any PLDM endpoint or Huawei NIC on the internal management bus, unlike the vendor-specific wangxun parser tracked separately.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7