CVE-2026-10651

Full vulnerability record from the local CVENow database.

Description

bt_sdp_parse_attribute() in subsys/bluetooth/host/classic/sdp.c validated only that the SDP record buffer held the type-marker byte plus the 2-byte attribute ID (a check of buf->len < 3) but then read a fourth byte, the data-element descriptor (type), via net_buf_simple_pull_u8(). Because net_buf_simple_pull_u8() dereferences buf->data[0] before its only bounds guard (an __ASSERT_NO_MSG that compiles out when CONFIG_ASSERT is disabled, the production default), a record of exactly three bytes (0x09 followed by a 2-byte attribute ID) causes a one-byte read past the end of the logical buffer. The parser is reachable from inbound, remote-controlled data: a Bluetooth BR/EDR peer acting as an SDP server returns discovery-response records that are stored verbatim in the client receive buffer and parsed via the public bt_sdp_get_attr()/bt_sdp_has_attr()/bt_sdp_record_parse() helpers. The over-read is bounded to a single byte that is used only as an internal length selector and is never leaked to the attacker; subsequent length checks then reject the malformed record. Realistic impact is therefore limited to an edge-case denial of service (a fault only if the record ends exactly at a mapped-memory boundary, or a deterministic assert panic when CONFIG_ASSERT=y). Affects Zephyr v4.3.0 and v4.4.0; fixed by adding sizeof(type) to the length check.

Severity

MEDIUM

CVSS score

6.5 (v3.1)

Vulnerability status

Modified

Source identifier

[email protected]

Published

2026-06-23 01:16:26.747000

Last modified

2026-10-25 23:10:00.167000

View original CVE JSON

{
  "id": "CVE-2026-10651",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-23T01:16:26.747",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "bt_sdp_parse_attribute() in subsys/bluetooth/host/classic/sdp.c validated only that the SDP record buffer held the type-marker byte plus the 2-byte attribute ID (a check of buf->len < 3) but then read a fourth byte, the data-element descriptor (type), via net_buf_simple_pull_u8(). Because net_buf_simple_pull_u8() dereferences buf->data[0] before its only bounds guard (an __ASSERT_NO_MSG that compiles out when CONFIG_ASSERT is disabled, the production default), a record of exactly three bytes (0x09 followed by a 2-byte attribute ID) causes a one-byte read past the end of the logical buffer. The parser is reachable from inbound, remote-controlled data: a Bluetooth BR/EDR peer acting as an SDP server returns discovery-response records that are stored verbatim in the client receive buffer and parsed via the public bt_sdp_get_attr()/bt_sdp_has_attr()/bt_sdp_record_parse() helpers. The over-read is bounded to a single byte that is used only as an internal length selector and is never leaked to the attacker; subsequent length checks then reject the malformed record. Realistic impact is therefore limited to an edge-case denial of service (a fault only if the record ends exactly at a mapped-memory boundary, or a deterministic assert panic when CONFIG_ASSERT=y). Affects Zephyr v4.3.0 and v4.4.0; fixed by adding sizeof(type) to the length check."
    },
    {
      "lang": "es",
      "value": "Un atributo SDP de Bluetooth Classic malformado puede desencadenar una aserción alcanzable en el analizador SDP de Zephyr. En subsys/bluetooth/host/classic/sdp.c, bt_sdp_parse_attribute() acepta un búfer de entrada una vez que contiene el tipo de atributo de 1 byte y el ID de atributo de 2 bytes, pero luego extrae incondicionalmente un byte adicional para el tipo de valor sin verificar que el byte esté presente. Un atributo truncado de 3 bytes (por ejemplo, 09 00 09) por lo tanto llega a net_buf_simple_pull() con una longitud restante insuficiente, desencadenando la verificación __ASSERT_NO_MSG(buf  ->  len >= len) y un pánico del kernel en compilaciones con aserciones habilitadas (denegación de servicio). En compilaciones donde las aserciones están deshabilitadas, el análisis puede continuar más allá del final del búfer disponible, lo que lleva a una lectura fuera de límites y un comportamiento indefinido."
    }
  ],
  "affected": [
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      "source": "[email protected]",
      "affectedData": [
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          "product": "zephyr",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
          "packageName": "zephyr",
          "programFiles": [
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          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
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          "scope": "UNCHANGED",
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          "value": "CWE-20"
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        {
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  "references": [
    {
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/dfac5224ab65fc7b81be2926386173c169318335",
      "source": "[email protected]"
    },
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      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p93g-3r68-cj53",
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}