CVE-2026-80951
CVE CVE-2026-80951EUVD EUVD-2026-76274Published 2026-09-11T19:42:21.000ZLast changed 2026-09-14T11:59:07.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux dd3c52846d5954acd43f0e771689302f27dadc28 <35aa6730b8c5626b879a4e893fe664f59bf07d7f; patch: 6.18.50; dd3c52846d5954acd43f0e771689302f27dadc28 <aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c; 5.12; patch: 7.3-rc1; dd3c52846d5954acd43f0e771689302f27dadc28 <f296a0d5907bf88314dfda67245f7f69d1552470; patch: 7.2.4; patch: 5.15.221; dd3c52846d5954acd43f0e771689302f27dadc28 <e2bda39d7f9f285ec803e200b5c1f17143d0b483; patch: 6.1.188; patch: 6.12.109; patch: 0; dd3c52846d5954acd43f0e771689302f27dadc28 <7c099b0b292a68d0ef558527945dbfb756fbf893; dd3c52846d5954acd43f0e771689302f27dadc28 <5697d779577e2786ff3348ae9b77020ac0cf0aab; patch: 6.6.157; dd3c52846d5954acd43f0e771689302f27dadc28 <7cc5ba756bc1cfffab9cb2695742f9f479dc73f7
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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