{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "91e5687805885f9fceb60b95e950a3d3bdcf4764"
            },
            {
              "fixed": "5657859851abb65105220a6cdb5804926249f714"
            },
            {
              "fixed": "72530e1f72b0515a73fd88292254d04fecf03649"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.8.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93251.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: bus: Introduce acpi_bus_get_primary_device()\n\nThe function used for obtaining the first \"physical\" device for which\nthe given ACPI one is the ACPI companion, acpi_get_first_physical_node(),\nmay return a stale device pointer (mostly in theory) because\nacpi_unbind_one() may run as a whole after dropping the ACPI device's\nphysical_node_lock in acpi_get_first_physical_node() and before it\nreturns.  The last reference to the \"physical\" device may be dropped\nthen before the pointer to it is returned to the caller.\n\nIf that happens and the acpi_get_first_physical_node() caller invokes\nget_device() on the pointer obtained from it, which is done by the\nmajority of its callers, a use-after-free will occur.\n\nTo prepare for addressing this problem, introduce a new function for\ngetting the first \"physical\" device associated with the given ACPI one\n(the \"primary physical device\") that will also reference count the\ndevice in question before returning a pointer to it.\n\nMake that new function and acpi_get_first_physical_node() share the\nphysical node list lookup code.\n\nNo intentional functional impact.",
  "id": "CVE-2026-93251",
  "modified": "2026-09-26T03:30:56.850963057Z",
  "published": "2026-09-24T15:51:27.511Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5657859851abb65105220a6cdb5804926249f714"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72530e1f72b0515a73fd88292254d04fecf03649"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93251.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93251"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ACPI: bus: Introduce acpi_bus_get_primary_device()"
}