Bluetooth: hci_sock: reject out-of-range OCF values

Overview

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sock: reject out-of-range OCF values

The raw HCI socket security filter has 128 OCF bits per supported OGF, but masks the 10-bit OCF with 127 before looking up the command. An unprivileged socket can therefore submit a reserved OCF that aliases an allowlisted command modulo 128.

A conforming controller should reject reserved opcodes. Nevertheless, the security decision must apply to the opcode that will actually be sent, especially since controller-specific behavior is outside the host stack's control.

Reject OCF values that cannot be represented by the security filter instead of aliasing them onto an unrelated command.

Affected

• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 70b0a27bdde0cb524349c8261202c7c9393cf5e9
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 598686f5d65b9af2223ed9d22fadba16e09f6ca8
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c1fd465ea1c5aef459f9bc3ac602b5353e0f536f
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 68f0bcc4e16e31ff8dbe6ca93116eb70d7b6ac44
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 320dedad15e8bbaecc8d2d7fd4189defb84caa85
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 173457fa3e99ef4188dd0fe63e4dee98d0e441a9
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 47d67ec424e63e61e9eb58633d43a9d58a1852b6
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e93fad891c72deb84cae49430163b384ebcc92b1
• Linux 2.6.12

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.