CVE - CVE-2024-26903

CVE-ID
CVE-2024-26903	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/2535b848fa0f42ddff3e5255cf5e742c9b77bb26 URL:https://git.kernel.org/stable/c/2535b848fa0f42ddff3e5255cf5e742c9b77bb26 MISC:https://git.kernel.org/stable/c/369f419c097e82407dd429a202cde9a73d3ae29b URL:https://git.kernel.org/stable/c/369f419c097e82407dd429a202cde9a73d3ae29b MISC:https://git.kernel.org/stable/c/3ead59bafad05f2967ae2438c0528d53244cfde5 URL:https://git.kernel.org/stable/c/3ead59bafad05f2967ae2438c0528d53244cfde5 MISC:https://git.kernel.org/stable/c/567c0411dc3b424fc7bd1e6109726d7ba32d4f73 URL:https://git.kernel.org/stable/c/567c0411dc3b424fc7bd1e6109726d7ba32d4f73 MISC:https://git.kernel.org/stable/c/5f369efd9d963c1f711a06c9b8baf9f5ce616d85 URL:https://git.kernel.org/stable/c/5f369efd9d963c1f711a06c9b8baf9f5ce616d85 MISC:https://git.kernel.org/stable/c/5f9fe302dd3a9bbc50f4888464c1773f45166bfd URL:https://git.kernel.org/stable/c/5f9fe302dd3a9bbc50f4888464c1773f45166bfd MISC:https://git.kernel.org/stable/c/81d7d920a22fd58ef9aedb1bd0a68ee32bd23e96 URL:https://git.kernel.org/stable/c/81d7d920a22fd58ef9aedb1bd0a68ee32bd23e96 MISC:https://git.kernel.org/stable/c/8d1753973f598531baaa2c1033cf7f7b5bb004b0 URL:https://git.kernel.org/stable/c/8d1753973f598531baaa2c1033cf7f7b5bb004b0
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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