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 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 published

13 Oct 2026 14:19:51 UTC

Source modified

14 Oct 2026 18:58:04 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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CVSS 3.1 · 3.5 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L