Updated: 2024-11-21
CWE: CWE-476
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.
CVSS3: 5.5
| OS | Vendor version | Errata |
|---|---|---|
| Oracle Linux 6 UEK 4 | 4.1.12-124.89.4.el6uek | ELSA-2024-12606 |
| Oracle Linux 7 UEK 4 | 4.1.12-124.89.4.el7uek | ELSA-2024-12606 |
| Ubuntu 14.04 HWE ESM | 4.4.0-258.292~14.04.2 | USN-6976-1 |
| Debian 10 | 4.19.316-1 | DLA-3840-1 |
| Debian 10 cloud | 4.19.316-1 | DLA-3840-1 |
| Ubuntu 20.04 | 5.4.0-189.209 | USN-6896-1 |
| Ubuntu 20.04 AWS | 5.4.0-1128.138 | USN-6896-5 |
| Ubuntu 20.04 Azure | 5.4.0-1133.140 | USN-6896-1 |
| Ubuntu 16.04 ESM | 4.4.0-258.292 | USN-6976-1 |
| Ubuntu 16.04 HWE ESM | 4.15.0-228.240~16.04.1 | USN-6972-1 |
| Ubuntu 16.04 AWS ESM | 4.4.0-1173.188 | USN-6976-1 |
| Ubuntu 16.04 AWS HWE ESM | 4.15.0-1172.185~16.04.1 | USN-6972-2 |
| Ubuntu 16.04 Azure ESM | 4.15.0-1180.195~16.04.1 | USN-6972-3 |
| Ubuntu 22.04 | 5.15.0-112.122 | USN-6820-1 |
| Ubuntu 22.04 AWS | 5.15.0-1063.69 | USN-6821-3 |
| Ubuntu 22.04 Azure | 5.15.0-1066.75 | USN-6821-4 |
| RHEL 9 | 5.14.0-503.11.1.el9_5 | RHSA-2024:9315 |
| Ubuntu 20.04 HWE AWS | 5.15.0-1063.69~20.04.1 | USN-6821-3 |
| Ubuntu 20.04 GCP | 5.4.0-1132.141 | USN-6896-1 |
| OS | Original kernel version | State |
|---|---|---|
| Oracle Linux 6 UEK 4 | |
Planned |
| Oracle Linux 7 UEK 4 | |
Planned |
| Ubuntu 14.04 HWE ESM | |
Planned |
| Ubuntu 18.04 HWE Focal |
5.4.0-53.59~18.04.1
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5.4.0-56.62~18.04.1
5.4.0-45.49~18.04.2
5.4.0-51.56~18.04.1
5.4.0-48.52~18.04.1
5.4.0-47.51~18.04.1
5.4.0-52.57~18.04.1
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5.4.0-149.166~18.04.1
5.4.0-150.167~18.04.1
|
Released |
| Debian 10 | |
Planned |
| Debian 10 cloud | |
Planned |
| Ubuntu 20.04 |
5.4.0-31.35
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5.4.0-28.32
5.4.0-34.38
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5.4.0-32.36
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5.4.0-56.62
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5.4.0-104.118
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5.4.0-113.127
5.4.0-117.132
5.4.0-121.137
5.4.0-120.136
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5.4.0-122.138
5.4.0-124.140
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5.4.0-128.144
5.4.0-131.147
5.4.0-132.148
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5.4.0-135.152
5.4.0-136.153
5.4.0-137.154
5.4.0-139.156
5.4.0-144.161
5.4.0-123.139
5.4.0-146.163
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5.4.0-145.162
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5.4.0-177.197
5.4.0-181.201
5.4.0-182.202
5.4.0-186.206
5.4.0-187.207
|
Released |
| Ubuntu 18.04 Azure Focal |
5.4.0-1032.33~18.04.1
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5.4.0-1023.23~18.04.1
5.4.0-1031.32~18.04.1
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5.4.0-1108.114~18.04.1
5.4.0-1109.115~18.04.1
|
Released |
| Ubuntu 20.04 AWS |
5.4.0-1030.31
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5.4.0-1022.22
5.4.0-1028.29
5.4.0-1025.25
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5.4.0-1024.24
5.4.0-1018.18
5.4.0-1011.11
5.4.0-1015.15
5.4.0-1034.35
5.4.0-1032.33
5.4.0-1021.21
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|
Released |
| Ubuntu 20.04 Azure |
5.4.0-1041.43
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5.4.0-1040.42
5.4.0-1023.23
5.4.0-1034.35
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5.4.0-1038.40
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Released |
| Ubuntu 16.04 ESM | |
Planned |
| Ubuntu 16.04 HWE ESM | |
Planned |
| Ubuntu 16.04 AWS ESM | |
Planned |
| Ubuntu 16.04 AWS HWE ESM | |
Planned |
| Ubuntu 16.04 Azure ESM | |
Planned |
| Ubuntu 22.04 | |
Ready For Release |
| Ubuntu 22.04 AWS | |
Planned |
| Ubuntu 22.04 Azure | |
Planned |
| RHEL 9 | |
Planned |
| Ubuntu 20.04 HWE AWS | |
Planned |
| Ubuntu 20.04 GCP |
5.4.0-1068.72
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5.4.0-1049.53
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|
Released |
| Ubuntu 18.04 HWE GCP |
5.4.0-1022.22~18.04.1
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5.4.0-1068.72~18.04.1
5.4.0-1021.21~18.04.1
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|
Released |