{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80951",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.804Z",
        "datePublished": "2026-09-11T19:42:21.115Z",
        "dateUpdated": "2026-10-19T08:45:35.194Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:45:35.194Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: svc: bound IBI payload to the requested max_payload_len\n\nsvc_i3c_master_handle_ibi() reads the IBI payload from the RX FIFO into\nthe IBI slot. The loop is bounded by the hardware FIFO size\n(SVC_I3C_FIFO_SIZE), not by the slot size.\n\nslot->data points into the IBI pool, which i3c_generic_ibi_alloc_pool()\nsizes at max_payload_len per slot. svc_i3c_master_request_ibi() only\nrejects a max_payload_len larger than SVC_I3C_FIFO_SIZE, so a driver can\nrequest a smaller one. mctp-i3c requests 1. Each readsb() then copies the\ncontroller RXCOUNT bytes (up to 31) with no check against the slot size.\nA device that sends more bytes than the slot holds writes past\nslot->data, an out-of-bounds write into the IBI pool.\n\nBound the loop by dev->ibi->max_payload_len and clamp each read to the\nspace left in the slot, the same way dw-i3c does. A device can still send\nmore than the requested payload. Flush the leftover bytes from the RX FIFO\nso they do not leak into the next transfer."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/i3c/master/svc-i3c-master.c"
                    ],
                    "versions": [
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "7c099b0b292a68d0ef558527945dbfb756fbf893",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "7cc5ba756bc1cfffab9cb2695742f9f479dc73f7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "35aa6730b8c5626b879a4e893fe664f59bf07d7f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "f296a0d5907bf88314dfda67245f7f69d1552470",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "5697d779577e2786ff3348ae9b77020ac0cf0aab",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3c52846d5954acd43f0e771689302f27dadc28",
                            "lessThan": "e2bda39d7f9f285ec803e200b5c1f17143d0b483",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/i3c/master/svc-i3c-master.c"
                    ],
                    "versions": [
                        {
                            "version": "5.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.109",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.50",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.4",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "5.15.221"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.1.188"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.6.157"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.12.109"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.18.50"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "7.2.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/7c099b0b292a68d0ef558527945dbfb756fbf893"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7cc5ba756bc1cfffab9cb2695742f9f479dc73f7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/35aa6730b8c5626b879a4e893fe664f59bf07d7f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f296a0d5907bf88314dfda67245f7f69d1552470"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5697d779577e2786ff3348ae9b77020ac0cf0aab"
                },
                {
                    "url": "https://git.kernel.org/stable/c/aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e2bda39d7f9f285ec803e200b5c1f17143d0b483"
                }
            ],
            "title": "i3c: master: svc: bound IBI payload to the requested max_payload_len",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}