Executive brief
A vulnerability exists in the Automotive Grade Linux (AGL) CAN service, which manages communication between a vehicle's internal computer systems and its physical hardware sensors. An attacker with access to the vehicle's internal network could trigger a system crash or potentially read sensitive memory data by sending specially crafted messages. This could lead to a loss of availability for critical vehicle monitoring services or the exposure of internal system information.
Technical details
A heap buffer over-read exists in the isotp-c library bundled with AGL's agl-service-can-low-level service (versions up to 17.1.12). In the isotp_continue_receive function within receive.c, the payload_length for a Single Frame is extracted from a 4-bit nibble in the CAN frame data, which can represent values up to 15. Because standard CAN frames are only 8 bytes and the payload starts at the second byte, only 7 bytes are actually available. When the nibble specifies a length greater than 7, a subsequent memcpy operation reads up to 8 bytes past the end of the source buffer. This can be triggered by an attacker on the adjacent CAN bus or through the AGL CAN service API, potentially leading to information disclosure or a denial-of-service condition.
Affected products
- Automotive Grade Linux (AGL) agl-service-can-low-level up to and including 17.1.12
Timeline
- 2026-04-30: disclosed: Initial disclosure by Innora Security Research
- 2026-05-01: advisory: CVE published to NVD