CVE-2025-39889
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: l2cap: Check encryption key size on incoming connection
This tests the security key with size from 1 to 15 bytes while the Security Mode 4 Level 4 requests 16 bytes key size.
Detalles técnicos trazas, registros y código del informe original
This is required for passing GAP/SEC/SEM/BI-04-C PTS test case:
Security Mode 4 Level 4, Responder - Invalid Encryption Key Size
- 128 bit
Currently PTS fails with the following logs:
- expected:Connection Response:
Code: [3 (0x03)] Code
Identifier: (lt)WildCard: Exists(gt)
Length: [8 (0x0008)]
Destination CID: (lt)WildCard: Exists(gt)
Source CID: [64 (0x0040)]
Result: [3 (0x0003)] Connection refused - Security block
Status: (lt)WildCard: Exists(gt),
but received:Connection Response:
Code: [3 (0x03)] Code
Identifier: [1 (0x01)]
Length: [8 (0x0008)]
Destination CID: [64 (0x0040)]
Source CID: [64 (0x0040)]
Result: [0 (0x0000)] Connection Successful
Status: [0 (0x0000)] No further information available
And HCI logs:
< HCI Command: Read Encrypti.. (0x05|0x0008) plen 2
Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)
> HCI Event: Command Complete (0x0e) plen 7
Read Encryption Key Size (0x05|0x0008) ncmd 1
Status: Success (0x00)
Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)
Key size: 7
> ACL Data RX: Handle 14 flags 0x02 dlen 12
L2CAP: Connection Request (0x02) ident 1 len 4
PSM: 4097 (0x1001)
Source CID: 64
< ACL Data TX: Handle 14 flags 0x00 dlen 16
L2CAP: Connection Response (0x03) ident 1 len 8
Destination CID: 64
Source CID: 64
Result: Connection successful (0x0000)
Status: No further information available (0x0000)CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.10%
- Percentil entre todas las CVEs puntuadas: 1
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-326
- CWE-326
Referencias
- https://git.kernel.org/stable/c/24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f
- https://git.kernel.org/stable/c/522e9ed157e3c21b4dd623c79967f72c21e45b78
- https://git.kernel.org/stable/c/9e3114958d87ea88383cbbf38c89e04b8ea1bce5
- https://git.kernel.org/stable/c/c6d527bbd3d3896375079f5dbc8b7f96734a3ba5
- https://git.kernel.org/stable/c/d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6
- https://git.kernel.org/stable/c/d4ca2fd218caafbf50e3343ba1260c6a23b5676a
- https://git.kernel.org/stable/c/ed503d340a501e414114ddc614a3aae4f6e9eae2
JSON original (NVD)
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: Check encryption key size on incoming connection\n\nThis is required for passing GAP/SEC/SEM/BI-04-C PTS test case:\n Security Mode 4 Level 4, Responder - Invalid Encryption Key Size\n - 128 bit\n\nThis tests the security key with size from 1 to 15 bytes while the\nSecurity Mode 4 Level 4 requests 16 bytes key size.\n\nCurrently PTS fails with the following logs:\n- expected:Connection Response:\n Code: [3 (0x03)] Code\n Identifier: (lt)WildCard: Exists(gt)\n Length: [8 (0x0008)]\n Destination CID: (lt)WildCard: Exists(gt)\n Source CID: [64 (0x0040)]\n Result: [3 (0x0003)] Connection refused - Security block\n Status: (lt)WildCard: Exists(gt),\nbut received:Connection Response:\n Code: [3 (0x03)] Code\n Identifier: [1 (0x01)]\n Length: [8 (0x0008)]\n Destination CID: [64 (0x0040)]\n Source CID: [64 (0x0040)]\n Result: [0 (0x0000)] Connection Successful\n Status: [0 (0x0000)] No further information available\n\nAnd HCI logs:\n< HCI Command: Read Encrypti.. (0x05|0x0008) plen 2\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\n> HCI Event: Command Complete (0x0e) plen 7\n Read Encryption Key Size (0x05|0x0008) ncmd 1\n Status: Success (0x00)\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\n Key size: 7\n> ACL Data RX: Handle 14 flags 0x02 dlen 12\n L2CAP: Connection Request (0x02) ident 1 len 4\n PSM: 4097 (0x1001)\n Source CID: 64\n< ACL Data TX: Handle 14 flags 0x00 dlen 16\n L2CAP: Connection Response (0x03) ident 1 len 8\n Destination CID: 64\n Source CID: 64\n Result: Connection successful (0x0000)\n Status: No further information available (0x0000)"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: l2cap: Verificar el tamaño de la clave de cifrado en la conexión entrante\n\nEsto es necesario para aprobar el caso de prueba GAP/SEC/SEM/BI-04-C PTS:\n Modo de seguridad 4 Nivel 4, Respondedor - Tamaño de clave de cifrado no válido\n - 128 bits\n\nEsto prueba la clave de seguridad con un tamaño de 1 a 15 bytes, mientras que el Modo de seguridad 4 Nivel 4 solicita un tamaño de clave de 16 bytes.\n\nActualmente, PTS falla con los siguientes registros:\n- esperado:Respuesta de conexión:\n Código: [3 (0x03)] Código\n Identificador: (lt)WildCard: Exists(gt)\n Longitud: [8 (0x0008)]\n CID de destino: (lt)WildCard: Exists(gt)\n CID de origen: [64 (0x0040)]\n Resultado: [3 (0x0003)] Conexión rechazada - Bloqueo de seguridad\n Estado: (lt)WildCard: Exists(gt),\npero recibido:Respuesta de conexión:\n Código: [3 (0x03)] Código\n Identificador: [1 (0x01)]\n Longitud: [8 (0x0008)]\n CID de destino: [64 (0x0040)]\n CID de origen: [64 (0x0040)]\n Resultado: [0 (0x0000)] Conexión exitosa\n Estado: [0 (0x0000)] No hay más información disponible\n\nY registros HCI:\n< Comando HCI: Leer Cifrado.. (0x05|0x0008) plen 2\n Handle: 14 Dirección: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\n> Evento HCI: Comando Completado (0x0e) plen 7\n Leer Tamaño de Clave de Cifrado (0x05|0x0008) ncmd 1\n Estado: Éxito (0x00)\n Handle: 14 Dirección: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\n Tamaño de clave: 7\n> Datos ACL RX: Handle 14 flags 0x02 dlen 12\n L2CAP: Solicitud de conexión (0x02) ident 1 len 4\n PSM: 4097 (0x1001)\n CID de origen: 64\n< Datos ACL TX: Handle 14 flags 0x00 dlen 16\n L2CAP: Respuesta de conexión (0x03) ident 1 len 8\n CID de destino: 64\n CID de origen: 64\n Resultado: Conexión exitosa (0x0000)\n Estado: No hay más información disponible (0x0000)"
}
],
"lastModified": "2026-09-26T00:10:00.127",
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