{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-81006",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.812Z",
        "datePublished": "2026-09-11T19:42:58.111Z",
        "dateUpdated": "2026-10-19T08:46:31.551Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:46:31.551Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: Remove all sysfs files on registration failure\n\nipmi_add_smi() creates the nr_users and nr_msgs files before trying to\ncreate the maintenance_mode file. If that last creation fails, the error\npath removes only nr_users before dropping the final reference to the\ninterface.\n\nRemove nr_msgs as well so no sysfs attribute embedded in the freed\ninterface remains registered."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - ipmi_add_smi() is reached only from local host-side SMI probe (ipmi_si, ipmi_ssif, ipmi_ipmb, ipmi_powernv) and the dangling nr_msgs file is hit by local sysfs read(2); IPMI-over-LAN is BMC firmware and does not enter this kernel path.\nAC:L - A local attacker can force device_create_file(maintenance_mode) to fail after nr_msgs is installed (memory pressure, hotmod/bind retries), then every read of the leftover attribute is a deterministic use-after-free with no race the attacker cannot control.\nPR:L - DEVICE_ATTR_RO(nr_msgs) is mode 0444 and nr_msgs_show() has no capability check, so any unprivileged local user who can read sysfs can trigger the UAF after a failed SMI registration; this is not limited to init-namespace root and is not a pre-auth network path.\nUI:N - The attacker causes SMI registration failure and then reads the leftover nr_msgs sysfs file themselves; no separate victim action such as mounting a filesystem or opening a hostile file is required.\nS:U - The use-after-free is of host-kernel struct ipmi_smi and its embedded device_attribute; impact stays in the same kernel security authority with no VM, IOMMU, or sandbox boundary crossing.\nC:H - The leftover sysfs attribute is embedded in the kmalloc'd ipmi_smi that intf_free() kfree()s, so nr_msgs_show() container_of() and the users-list walk are a slab use-after-free that can be reclaimed for arbitrary kernel memory disclosure.\nI:H - sysfs dispatches through device_attribute.show stored in the freed ipmi_smi, and nr_msgs_show() takes users_mutex and walks intf->users on that object, enabling heap spray and control-flow hijack per kernel UAF guidance.\nA:H - Reading the dangling nr_msgs file dereferences freed ipmi_smi memory (mutex_lock and list traversal) and readily oopses or panics the kernel; any use-after-free is High availability impact even without full exploitation."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/char/ipmi/ipmi_msghandler.c"
                    ],
                    "versions": [
                        {
                            "version": "627118470fccc61d7763aa667fcab0a9476843f6",
                            "lessThan": "d46c97eddcbc53ca885e8bb359930c58884616ff",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "627118470fccc61d7763aa667fcab0a9476843f6",
                            "lessThan": "b115b7d06f26b3f000d2afda88acb54c7a7cb2c9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "627118470fccc61d7763aa667fcab0a9476843f6",
                            "lessThan": "b6c46ab0bdee90c238e96ea4a74972118c97900d",
                            "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/char/ipmi/ipmi_msghandler.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "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": "6.18",
                                    "versionEndExcluding": "6.18.50"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "7.2.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/d46c97eddcbc53ca885e8bb359930c58884616ff"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b115b7d06f26b3f000d2afda88acb54c7a7cb2c9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b6c46ab0bdee90c238e96ea4a74972118c97900d"
                }
            ],
            "title": "ipmi: Remove all sysfs files on registration failure",
            "x_generator": {
                "engine": "bippy-1.2.0"
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}