CVE-2026-65200
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.
- Score
- CVSS 3.1 3.5 Low
- Status
- Deferred - 44488dab-36db-4358-99f9-bc116477f914
- Published
- 2026-10-13
- Last modified
- 2026-10-16
- Weaknesses
- CWE-191
Affected products
References
- https://www.runzero.com/advisories/huawei-malicious-device-integer-underflow-cve-2026-65200
