FKIE_CVE-2024-26903

Vulnerability from fkie_nvd - Published: 2024-04-17 11:15 - Updated: 2026-05-12 12:16
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: rfcomm: Fix null-ptr-deref in rfcomm_check_security During our fuzz testing of the connection and disconnection process at the RFCOMM layer, we discovered this bug. By comparing the packets from a normal connection and disconnection process with the testcase that triggered a KASAN report. We analyzed the cause of this bug as follows: 1. In the packets captured during a normal connection, the host sends a `Read Encryption Key Size` type of `HCI_CMD` packet (Command Opcode: 0x1408) to the controller to inquire the length of encryption key.After receiving this packet, the controller immediately replies with a Command Completepacket (Event Code: 0x0e) to return the Encryption Key Size. 2. In our fuzz test case, the timing of the controller's response to this packet was delayed to an unexpected point: after the RFCOMM and L2CAP layers had disconnected but before the HCI layer had disconnected. 3. After receiving the Encryption Key Size Response at the time described in point 2, the host still called the rfcomm_check_security function. However, by this time `struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;` had already been released, and when the function executed `return hci_conn_security(conn->hcon, d->sec_level, auth_type, d->out);`, specifically when accessing `conn->hcon`, a null-ptr-deref error occurred. To fix this bug, check if `sk->sk_state` is BT_CLOSED before calling rfcomm_recv_frame in rfcomm_process_rx.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2535b848fa0f42ddff3e5255cf5e742c9b77bb26Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/369f419c097e82407dd429a202cde9a73d3ae29bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ead59bafad05f2967ae2438c0528d53244cfde5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/567c0411dc3b424fc7bd1e6109726d7ba32d4f73Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f369efd9d963c1f711a06c9b8baf9f5ce616d85Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f9fe302dd3a9bbc50f4888464c1773f45166bfdPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/81d7d920a22fd58ef9aedb1bd0a68ee32bd23e96Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d1753973f598531baaa2c1033cf7f7b5bb004b0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2535b848fa0f42ddff3e5255cf5e742c9b77bb26Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/369f419c097e82407dd429a202cde9a73d3ae29bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3ead59bafad05f2967ae2438c0528d53244cfde5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/567c0411dc3b424fc7bd1e6109726d7ba32d4f73Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5f369efd9d963c1f711a06c9b8baf9f5ce616d85Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5f9fe302dd3a9bbc50f4888464c1773f45166bfdPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/81d7d920a22fd58ef9aedb1bd0a68ee32bd23e96Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8d1753973f598531baaa2c1033cf7f7b5bb004b0Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-265688.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: rfcomm: Fix null-ptr-deref in rfcomm_check_security\n\nDuring our fuzz testing of the connection and disconnection process at the\nRFCOMM layer, we discovered this bug. By comparing the packets from a\nnormal connection and disconnection process with the testcase that\ntriggered a KASAN report. We analyzed the cause of this bug as follows:\n\n1. In the packets captured during a normal connection, the host sends a\n`Read Encryption Key Size` type of `HCI_CMD` packet\n(Command Opcode: 0x1408) to the controller to inquire the length of\nencryption key.After receiving this packet, the controller immediately\nreplies with a Command Completepacket (Event Code: 0x0e) to return the\nEncryption Key Size.\n\n2. In our fuzz test case, the timing of the controller\u0027s response to this\npacket was delayed to an unexpected point: after the RFCOMM and L2CAP\nlayers had disconnected but before the HCI layer had disconnected.\n\n3. After receiving the Encryption Key Size Response at the time described\nin point 2, the host still called the rfcomm_check_security function.\nHowever, by this time `struct l2cap_conn *conn = l2cap_pi(sk)-\u003echan-\u003econn;`\nhad already been released, and when the function executed\n`return hci_conn_security(conn-\u003ehcon, d-\u003esec_level, auth_type, d-\u003eout);`,\nspecifically when accessing `conn-\u003ehcon`, a null-ptr-deref error occurred.\n\nTo fix this bug, check if `sk-\u003esk_state` is BT_CLOSED before calling\nrfcomm_recv_frame in rfcomm_process_rx."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: Bluetooth: rfcomm: corrija null-ptr-deref en rfcomm_check_security Durante nuestras pruebas preliminares del proceso de conexi\u00f3n y desconexi\u00f3n en la capa RFCOMM, descubrimos este error. Comparando los paquetes de un proceso normal de conexi\u00f3n y desconexi\u00f3n con el caso de prueba que desencaden\u00f3 un informe KASAN. Analizamos la causa de este error de la siguiente manera: 1. En los paquetes capturados durante una conexi\u00f3n normal, el host env\u00eda un paquete `HCI_CMD` del tipo `Read Encryption Key Size` (c\u00f3digo de operaci\u00f3n de comando: 0x1408) al controlador para consultar la longitud. de clave de cifrado. Despu\u00e9s de recibir este paquete, el controlador responde inmediatamente con un paquete de comando completo (c\u00f3digo de evento: 0x0e) para devolver el tama\u00f1o de la clave de cifrado. 2. En nuestro caso de prueba fuzz, el tiempo de respuesta del controlador a este paquete se retras\u00f3 hasta un punto inesperado: despu\u00e9s de que las capas RFCOMM y L2CAP se desconectaran, pero antes de que se desconectara la capa HCI. 3. Despu\u00e9s de recibir la respuesta del tama\u00f1o de la clave de cifrado en el momento descrito en el punto 2, el host a\u00fan llam\u00f3 a la funci\u00f3n rfcomm_check_security. Sin embargo, en ese momento `struct l2cap_conn *conn = l2cap_pi(sk)-\u0026gt;chan-\u0026gt;conn;` ya se hab\u00eda lanzado, y cuando se ejecut\u00f3 la funci\u00f3n `return hci_conn_security(conn-\u0026gt;hcon, d-\u0026gt;sec_level, auth_type, d -\u0026gt;out);`, espec\u00edficamente al acceder a `conn-\u0026gt;hcon`, ocurri\u00f3 un error null-ptr-deref. Para corregir este error, verifique si `sk-\u0026gt;sk_state` est\u00e1 BT_CLOSED antes de llamar a rfcomm_recv_frame en rfcomm_process_rx."
    }
  ],
  "id": "CVE-2024-26903",
  "lastModified": "2026-05-12T12:16:25.567",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "lang": "en",
          "value": "CWE-476"
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          "value": "CWE-476"
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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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