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ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root acpi_pci_root_add() assigns the freshly allocated root to device->driver_data before dmar_device_add() and pci_acpi_scan_root(). Both failure paths reach the end: label where root is kfree()'d, but only the pci_acpi_scan_root() path clears driver_data first. When dmar_device_add() fails during a hot-add, root is freed while device->driver_data still points at it. The ACPI core does not clear driver_data on attach failure, so a later acpi_pci_find_root() call may dereference this dangling pointer. acpi_pci_root_remove() has the same problem: it frees root without clearing device->driver_data, leaving a dangling pointer behind after the root bridge is removed. Move the NULL assignment to the shared end: label so every error path in acpi_pci_root_add() clears driver_data before freeing root, and clear it in acpi_pci_root_remove() as well, so the object is never left reachable through driver_data after being freed.

Announced Source revision 1
Original source ↗

CVE-2026-92521

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-92521

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "321bb0eb1486a0d575f02e24e3f4170e408c2f51",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "a285fa3780c768dcc51c76768707d099a2cc611d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "6aaf6dbf54fdfae096f3f90a79e9614e46579280",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "70cf773cca30a10b4964c24520a71279c974b899",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "3eee4c21931dc048ce63b86809f04e4e6f0dcad5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "db89b4f0dbab837d0f3de2c3e9427a8d5393afa3",
        "lessThan": "8a742141f7ab84975aa758b775567ef4740ef0cf",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/acpi/pci_root.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.28"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.28",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/acpi/pci_root.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-92521

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37768 · Revision 1
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Publisher date
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