AGL agl-service-can-low-level Destination uds.c send_diagnostic_request payload_length buffer overflow

Summaryinfo

A vulnerability labeled as critical has been found in AGL agl-service-can-low-level. The affected element is the function send_diagnostic_request of the file uds.c of the component Destination Handler. The manipulation of the argument payload_length results in buffer overflow. This vulnerability is reported as CVE-2026-42485. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in AGL agl-service-can-low-level (the affected version unknown). It has been classified as critical. Affected is 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. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

AGL agl-service-can-low-level 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 available at gerrit.automotivelinux.org. This vulnerability is traded as CVE-2026-42485 since 04/27/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/01/2026).

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-2026-26698). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• AGL

Name

• agl-service-can-low-level

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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