{"id":"CVE-2026-92521","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root\n\nacpi_pci_root_add() assigns the freshly allocated root to\ndevice->driver_data before dmar_device_…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root\n\nacpi_pci_root_add() assigns the freshly allocated root to\ndevice->driver_data before dmar_device_…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 321bb0eb1486a0d575f02e24e3f4170e408c2f51","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < a285fa3780c768dcc51c76768707d099a2cc611d","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 6aaf6dbf54fdfae096f3f90a79e9614e46579280","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 70cf773cca30a10b4964c24520a71279c974b899","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 3eee4c21931dc048ce63b86809f04e4e6f0dcad5","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217","Linux >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 < 8a742141f7ab84975aa758b775567ef4740ef0cf","Linux 2.6.28"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:55.013","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92521","references":[{"url":"https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.776Z","epss":0.0022,"epssPercentile":0.11053,"slug":"CVE-2026-92521","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root\n\nacpi_pci_root_add() assigns the freshly allocated root to\ndevice->driver_data before dmar_device_add() and pci_acpi_scan_root().\nBoth failure paths reach the end: label where root is kfree()'d, but\nonly the pci_acpi_scan_root() path clears driver_data first.\n\nWhen dmar_device_add() fails during a hot-add, root is freed while\ndevice->driver_data still points at it.  The ACPI core does not clear\ndriver_data on attach failure, so a later acpi_pci_find_root() call may\ndereference this dangling pointer.\n\nacpi_pci_root_remove() has the same problem: it frees root without\nclearing device->driver_data, leaving a dangling pointer behind after\nthe root bridge is removed.\n\nMove the NULL assignment to the shared end: label so every error path in\nacpi_pci_root_add() clears driver_data before freeing root, and clear it\nin acpi_pci_root_remove() as well, so the object is never left reachable\nthrough driver_data after being freed.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}