Arbitrary memory write via underflowed sequence index
Published May 1, 2026 · Updated May 1, 2026
Integer underflow in Open-SAE-J1939 allows attackers to write arbitrary memory through a crafted CAN frame sequence number. SAE_J1939_Read_Transport_Protocol_Data_Transfer subtracts one from the unvalidated sequence byte, so zero wraps the index before seven payload bytes are copied out of bounds. The attacker must deliver a malicious J1939 transport data-transfer frame over a reachable network path or directly on the CAN bus.
Summary
What happened
Integer underflow in Open-SAE-J1939 allows attackers to write arbitrary memory through a crafted CAN frame sequence number. SAE_J1939_Read_Transport_Protocol_Data_Transfer subtracts one from the unvalidated sequence byte, so zero wraps the index before seven payload bytes are copied out of bounds. The attacker must deliver a malicious J1939 transport data-transfer frame over a reachable network path or directly on the CAN bus.
The record
- CVE
- CVE-2026-37534
- Published
- May 1, 2026
- Updated
- May 1, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-191, T0866
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 1, 2026CVE publishedPublication date reported by the CVE source.
- May 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Attacks
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