{"cve":"CVE-2025-40211","nvd":{"published":"2025-11-21T11:15:49.513","modified":"2026-10-19T19:10:00.130","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: video: Fix use-after-free in acpi_video_switch_brightness()\n\nThe switch_brightness_work delayed work accesses device->brightness\nand device->backlight, freed by acpi_video_dev_unregister_backlight()\nduring device removal.\n\nIf the work executes after acpi_video_bus_unregister_backlight()\nfrees these resources, it causes a use-after-free when\nacpi_video_switch_brightness() dereferences device->brightness or\ndevice->backlight.\n\nFix this by calling cancel_delayed_work_sync() for each device's\nswitch_brightness_work in acpi_video_bus_remove_notify_handler()\nafter removing the notify handler that queues the work. This ensures\nthe work completes before the memory is freed.\n\n[ rjw: Changelog edit ]","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/293125536ef5521328815fa7c76d5f9eb1635659","https://git.kernel.org/stable/c/3f803ccf5a0c043e7c8b83f6665b082401fc8bee","https://git.kernel.org/stable/c/4e85246ec0d019dfba86ba54d841ef6694f97149","https://git.kernel.org/stable/c/8f067aa59430266386b83c18b983ca583faa6a11","https://git.kernel.org/stable/c/a63a5b6fb508d78fe57ae3b159d9ef3af7ba80e9"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:02.354564667+00:00"},"epss":{"cve":"CVE-2025-40211","score":0.0021,"percentile":0.11057,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}