{"id":"CVE-2026-92521","summary":"ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root","details":"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-\u003edriver_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-\u003edriver_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-\u003edriver_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.","modified":"2026-09-18T03:48:41.144677307Z","published":"2026-09-17T16:10:28.144Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92521.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92521.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92521"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"db89b4f0dbab837d0f3de2c3e9427a8d5393afa3"},{"fixed":"321bb0eb1486a0d575f02e24e3f4170e408c2f51"},{"fixed":"3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2"},{"fixed":"a285fa3780c768dcc51c76768707d099a2cc611d"},{"fixed":"6aaf6dbf54fdfae096f3f90a79e9614e46579280"},{"fixed":"70cf773cca30a10b4964c24520a71279c974b899"},{"fixed":"3eee4c21931dc048ce63b86809f04e4e6f0dcad5"},{"fixed":"6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217"},{"fixed":"8a742141f7ab84975aa758b775567ef4740ef0cf"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92521.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.28"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92521.json"}}],"schema_version":"1.9.0"}