zephyrproject-rtos Zephyr up to 4.3.0 solicitation.c bt_mesh_sol_recv out-of-bounds write

Summaryinfo

A vulnerability classified as critical was found in zephyrproject-rtos Zephyr up to 4.3.0. This impacts the function bt_mesh_sol_recv of the file subsys/bluetooth/mesh/solicitation.c. Executing a manipulation can lead to out-of-bounds write. This vulnerability is registered as CVE-2026-5589. No exploit is available.

Detailsinfo

A vulnerability has been found in zephyrproject-rtos Zephyr up to 4.3.0 and classified as critical. This vulnerability affects the function bt_mesh_sol_recv of the file subsys/bluetooth/mesh/solicitation.c. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An integer underflow in bt_mesh_sol_recv() in the Bluetooth Mesh solicitation handling (subsys/bluetooth/mesh/solicitation.c) leads to an out-of-bounds write. When CONFIG_BT_MESH_OD_PRIV_PROXY_SRV is enabled, the function parses solicitation PDUs from raw BLE advertising payloads. The AD parsing loop reads an attacker-controlled length byte (reported_len) and computes reported_len - 3 without checking that reported_len >= 3. When reported_len is less than 3, the subtraction is performed in signed int arithmetic and yields a negative value that bypasses the length guard and is then implicitly converted to a very large size_t when passed to net_buf_simple_pull_mem(). In builds without assertions, this wraps the buffer length and advances the data pointer far out of bounds, so subsequent reads dereference invalid memory. A nearby BLE device can trigger this with a non-connectable advertisement carrying a UUID16 AD structure and a crafted length byte, with no pairing or prior association required, potentially leading to denial of service or arbitrary code execution.

The advisory is available at github.com. This vulnerability was named CVE-2026-5589 since 04/05/2026. The exploitation appears to be easy. 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 06/05/2026).

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-2026-34322). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Project Management Software

Vendor

• zephyrproject-rtos

Name

• Zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3.0

License

• open-source

Website

• Product: https://github.com/zephyrproject-rtos/zephyr/

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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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