EUVD-2026-26690CVSS VectorNVD
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
collin80/Open-SAE-J1939 thru commit 744024d4306bc387857dfce439558336806acb06 (2023-03-08) contains an integer underflow leading to out-of-bounds write in Transport Protocol Data Transfer handling. At line 23: uint8_t index = data[0] - 1. When data[0] (sequence number from CAN frame) is 0, index underflows to 255. Subsequent write at tp_dt->data[255*7 + i-1] reaches offset 1791, exceeding the MAX_TP_DT buffer (1785 bytes) by 6 bytes.
AnalysisAI
Integer underflow in Open-SAE-J1939 Transport Protocol handler allows adjacent network attackers to corrupt memory via crafted CAN frames. Attackers sending J1939 Transport Protocol Data Transfer frames with sequence number 0 trigger underflow to 255, writing 6 bytes beyond a 1785-byte buffer boundary. …
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RemediationAI
Within 24 hours: Inventory all systems running Open-SAE-J1939 protocol handlers; identify network segments with direct CAN access. Within 7 days: Isolate or air-gap affected systems if operationally feasible; restrict CAN network access to trusted endpoints only; implement network segmentation between safety-critical and general-purpose CAN buses. …
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External POC / Exploit Code
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