CVE-2026-81006 (GCVE-0-2026-81006)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:46
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipmi: Remove all sysfs files on registration failure ipmi_add_smi() creates the nr_users and nr_msgs files before trying to create the maintenance_mode file. If that last creation fails, the error path removes only nr_users before dropping the final reference to the interface. Remove nr_msgs as well so no sysfs attribute embedded in the freed interface remains registered.
References
Impacted products
Vendor Product Version
Linux Linux Version: 627118470fccc61d7763aa667fcab0a9476843f6
Version: 627118470fccc61d7763aa667fcab0a9476843f6
Version: 627118470fccc61d7763aa667fcab0a9476843f6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/ipmi/ipmi_msghandler.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d46c97eddcbc53ca885e8bb359930c58884616ff",
              "status": "affected",
              "version": "627118470fccc61d7763aa667fcab0a9476843f6",
              "versionType": "git"
            },
            {
              "lessThan": "b115b7d06f26b3f000d2afda88acb54c7a7cb2c9",
              "status": "affected",
              "version": "627118470fccc61d7763aa667fcab0a9476843f6",
              "versionType": "git"
            },
            {
              "lessThan": "b6c46ab0bdee90c238e96ea4a74972118c97900d",
              "status": "affected",
              "version": "627118470fccc61d7763aa667fcab0a9476843f6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/ipmi/ipmi_msghandler.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027d 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-\u003eusers 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:31.551Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81006",
    "datePublished": "2026-09-11T19:42:58.111Z",
    "dateReserved": "2026-08-26T14:34:25.812Z",
    "dateUpdated": "2026-10-19T08:46:31.551Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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