AGL agl-service-can-low-level/but copies up to 17.1.12 Destination uds.c send_diagnostic_request payload_length buffer overflow

Summaryinfo

A vulnerability identified as critical has been detected in AGL agl-service-can-low-level and but copies up to 17.1.12. Impacted is the function send_diagnostic_request of the file uds.c of the component Destination Handler. The manipulation of the argument payload_length leads to buffer overflow. This vulnerability is documented as CVE-2026-37530. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in AGL agl-service-can-low-level and but copies up to 17.1.12 and classified as critical. This issue affects the function send_diagnostic_request of the file uds.c of the component Destination Handler. The manipulation of the argument payload_length with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

AGL agl-service-can-low-level thru 17.1.12 contains a stack buffer overflow in the uds-c library. The send_diagnostic_request function in uds.c allocates a 6-byte stack buffer (MAX_DIAGNOSTIC_PAYLOAD_SIZE=6) but copies up to 7 bytes (MAX_UDS_REQUEST_PAYLOAD_LENGTH=7) via memcpy at an offset of 1+pid_length (2-3 bytes), resulting in 1-4 bytes of controlled stack overflow. The payload_length field (uint8_t) has no bounds check against the destination buffer. On 32-bit ARM automotive ECUs without stack canaries, this can lead to return address overwrite and RCE.

The advisory is shared at gerrit.automotivelinux.org. The identification of this vulnerability is CVE-2026-37530 since 04/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/21/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-26683). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• AGL

Name

• agl-service-can-low-level
• but copies

Version

• 17.1.0
• 17.1.1
• 17.1.2
• 17.1.3
• 17.1.4
• 17.1.5
• 17.1.6
• 17.1.7
• 17.1.8
• 17.1.9
• 17.1.10
• 17.1.11
• 17.1.12

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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