CVE-2026-80951
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, svc_i3c_master_handle_ibi() reads the IBI payload from the RX FIFO into the slot, bounding the loop by the hardware FIFO size (SVC_I3C_FIFO_SIZE) rather than the slot size. A driver can request a smaller max_payload_len (e.g., mctp-i3c requests 1), so a device sending more bytes writes past slot->data, an out-of-bounds write into the IBI pool.
Risk Assessment
An out-of-bounds write in kernel memory can lead to memory corruption, system crashes, or potential privilege escalation. Affects systems with the SVC I3C controller and drivers such as mctp-i3c.
Recommendation
Update the Linux kernel to a version that bounds the loop by dev->ibi->max_payload_len, clamps each read to the space left in the slot, and flushes leftover bytes from the RX FIFO. Until patched, avoid using IBI drivers with a small max_payload_len.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS