{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40211 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40211 is an use after free vulnerability in Linux, published on 21 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-40211 and fix it if it is affected.\n\nWhat it is: CVE-2025-40211 is an use after free vulnerability in Linux, published on 21 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-40211 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-40211/ (Markdown: https://insights.sbomify.com/CVE-2025-40211/index.md)","id":"CVE-2025-40211","markdown":"https://insights.sbomify.com/CVE-2025-40211/index.md","name":"CVE-2025-40211","record":{"aliases":["AZL-70657","BELL-CVE-2025-40211","DEBIAN-CVE-2025-40211","GHSA-3xv8-84fj-hhg4","ROOT-OS-DEBIAN-11-CVE-2025-40211","ROOT-OS-DEBIAN-12-CVE-2025-40211","ROOT-OS-DEBIAN-13-CVE-2025-40211","ROOT-OS-UBUNTU-2204-CVE-2025-40211","ROOT-OS-UBUNTU-2404-CVE-2025-40211","UBUNTU-CVE-2025-40211"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free in the Linux kernel ACPI video driver allows local attackers to execute arbitrary code or escalate privileges.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"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-\u003ebrightness\nand device-\u003ebacklight, 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-\u003ebrightness or\ndevice-\u003ebacklight.\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 ]","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"ACPI: video: Fix use-after-free in acpi_video_switch_brightness()","id":"CVE-2025-40211","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":8,"next":{"headline":"nfsd: fix refcount leak in nfsd_set_fh_dentry()","id":"CVE-2025-40212"},"packages":[],"prev":{"headline":"Revert \"NFSD: Remove the cap on number of operations per NFSv4 COMPOUND\"","id":"CVE-2025-40210"},"products":["Linux"],"published":"2025-11-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-16","vendors":["Linux"]},"summary":"A use-after-free in the Linux kernel ACPI video driver allows local attackers to execute arbitrary code or escalate privileges.","url":"https://insights.sbomify.com/CVE-2025-40211/"}