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NOTICE UPDATED - May, 29th 2024

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CVE-2024-26903 Detail

Description

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.


Severity



CVSS 4.0 Severity and Metrics:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/2535b848fa0f42ddff3e5255cf5e742c9b77bb26 Patch 
https://git.kernel.org/stable/c/369f419c097e82407dd429a202cde9a73d3ae29b Patch 
https://git.kernel.org/stable/c/3ead59bafad05f2967ae2438c0528d53244cfde5 Patch 
https://git.kernel.org/stable/c/567c0411dc3b424fc7bd1e6109726d7ba32d4f73 Patch 
https://git.kernel.org/stable/c/5f369efd9d963c1f711a06c9b8baf9f5ce616d85 Patch 
https://git.kernel.org/stable/c/5f9fe302dd3a9bbc50f4888464c1773f45166bfd Patch 
https://git.kernel.org/stable/c/81d7d920a22fd58ef9aedb1bd0a68ee32bd23e96 Patch 
https://git.kernel.org/stable/c/8d1753973f598531baaa2c1033cf7f7b5bb004b0 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-26903
NVD Published Date:
04/17/2024
NVD Last Modified:
04/29/2024
Source:
kernel.org