Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: i3c: master: svc: bound IBI payload to the requested max_payload_len svc_i3c_master_handle_ibi() reads the IBI payload from the RX FIFO into the IBI slot. The loop is bounded by the hardware FIFO size (SVC_I3C_FIFO_SIZE), not by the slot size. slot->data points into the IBI pool, which i3c_generic_ibi_alloc_pool() sizes at max_payload_len per slot. svc_i3c_master_request_ibi() only rejects a max_payload_len larger than SVC_I3C_FIFO_SIZE, so a driver can request a smaller one. mctp-i3c requests 1. Each readsb() then copies the controller RXCOUNT bytes (up to 31) with no check against the slot size. A device that sends more bytes than the slot holds writes past slot->data, an out-of-bounds write into the IBI pool. Bound the loop by dev->ibi->max_payload_len and clamp each read to the space left in the slot, the same way dw-i3c does. A device can still send more than the requested payload. Flush the leftover bytes from the RX FIFO so they do not leak into the next transfer.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected dd3c52846d5954acd43f0e771689302f27dadc28 before 7c099b0b292a68d0ef558527945dbfb756fbf893; affected dd3c52846d5954acd43f0e771689302f27dadc28 before 7cc5ba756bc1cfffab9cb2695742f9f479dc73f7; affected dd3c52846d5954acd43f0e771689302f27dadc28 before 35aa6730b8c5626b879a4e893fe664f59bf07d7f; affected dd3c52846d5954acd43f0e771689302f27dadc28 before f296a0d5907bf88314dfda67245f7f69d1552470; affected dd3c52846d5954acd43f0e771689302f27dadc28 before 5697d779577e2786ff3348ae9b77020ac0cf0aab; affected dd3c52846d5954acd43f0e771689302f27dadc28 before aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c; affected dd3c52846d5954acd43f0e771689302f27dadc28 before e2bda39d7f9f285ec803e200b5c1f17143d0b483 |
| Linux / Linux | affected 5.12; unaffected 0 before 5.12; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7c099b0b292a68d0ef558527945dbfb756fbf893
- https://git.kernel.org/stable/c/7cc5ba756bc1cfffab9cb2695742f9f479dc73f7
- https://git.kernel.org/stable/c/35aa6730b8c5626b879a4e893fe664f59bf07d7f
- https://git.kernel.org/stable/c/f296a0d5907bf88314dfda67245f7f69d1552470
- https://git.kernel.org/stable/c/5697d779577e2786ff3348ae9b77020ac0cf0aab
- https://git.kernel.org/stable/c/aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c
- https://git.kernel.org/stable/c/e2bda39d7f9f285ec803e200b5c1f17143d0b483