CVE-2026-37537

HIGH

Open-SAE-J1939 Integer Underflow to Out-of-Bounds Write in Transport Protocol Data Transfer

Title source: llm

Description

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.

References (3)

Core 3

Core References

https://github.com/DanielMartensson/Open-SAE-J1939

https://github.com/collin80/Open-SAE-J1939

https://gist.github.com/sgInnora/f4ac66faeefe07a653ceeb3f58cdc381

Scores

CVSS v3 8.1

EPSS 0.0022

EPSS Percentile 12.4%

Attack Vector ADJACENT_NETWORK

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-190

Status published

Published May 01, 2026

Tracked Since May 01, 2026