In the Linux kernel, the following vulnerability has been resolved: ACPI: video: Fix use-after-free in acpi_video_switch_brightness() The switch_brightness_work delayed work accesses device->brightness and device->backlight, freed by acpi_video_dev_unregister_backlight() during device removal. If the work executes after acpi_video_bus_unregister_backlight() frees these resources, it causes a use-after-free when acpi_video_switch_brightness() dereferences device->brightness or device->backlight. Fix this by calling cancel_delayed_work_sync() for each device's switch_brightness_work in acpi_video_bus_remove_notify_handler() after removing the notify handler that queues the work. This ensures the work completes before the memory is freed. [ rjw: Changelog edit ]

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4404 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4404-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                        Ben Hutchings     December 12, 2025                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : linux     Version        : 5.10.247-1     CVE ID         : CVE-2023-53498 CVE-2024-47666 CVE-2024-50143 CVE-2024-57947                      CVE-2025-21861 CVE-2025-21887 CVE-2025-22058 CVE-2025-23143                      CVE-2025-38678 CVE-2025-39866 CVE-2025-39869 CVE-2025-39876                      CVE-2025-39883 CVE-2025-39885 CVE-2025-39907 CVE-2025-39911                      CVE-2025-39913 CVE-2025-39923 CVE-2025-39937 CVE-2025-39945                      CVE-2025-39949 CVE-2025-39951 CVE-2025-39953 CVE-2025-39955                      CVE-2025-39964 CVE-2025-39967 CVE-2025-39968 CVE-2025-39969                      CVE-2025-39970 CVE-2025-39971 CVE-2025-39972 CVE-2025-39973                      CVE-2025-39980 CVE-2025-39985 CVE-2025-39986 CVE-2025-39987                      CVE-2025-39993 CVE-2025-39994 CVE-2025-39995 CVE-2025-39996                      CVE-2025-39998 CVE-2025-40001 CVE-2025-40006 CVE-2025-40011                      CVE-2025-40018 CVE-2025-40019 CVE-2025-40020 CVE-2025-40021                      CVE-2025-40022 CVE-2025-40026 CVE-2025-40027 CVE-2025-40029                      CVE-2025-40030 CVE-2025-40035 CVE-2025-40042 CVE-2025-40044                      CVE-2025-40048 CVE-2025-40049 CVE-2025-40053 CVE-2025-40055                      CVE-2025-40070 CVE-2025-40078 CVE-2025-40081 CVE-2025-40083                      CVE-2025-40087 CVE-2025-40088 CVE-2025-40105 CVE-2025-40106                      CVE-2025-40109 CVE-2025-40111 CVE-2025-40115 CVE-2025-40116                      CVE-2025-40118 CVE-2025-40121 CVE-2025-40125 CVE-2025-40127                      CVE-2025-40134 CVE-2025-40140 CVE-2025-40153 CVE-2025-40154                      CVE-2025-40167 CVE-2025-40173 CVE-2025-40178 CVE-2025-40183                      CVE-2025-40186 CVE-2025-40187 CVE-2025-40188 CVE-2025-40190                      CVE-2025-40194 CVE-2025-40197 CVE-2025-40198 CVE-2025-40200                      CVE-2025-40204 CVE-2025-40205 CVE-2025-40211 CVE-2025-40219                      CVE-2025-40220 CVE-2025-40223 CVE-2025-40231 CVE-2025-40233                      CVE-2025-40240 CVE-2025-40243 CVE-2025-40244 CVE-2025-40248                      CVE-2025-40254 CVE-2025-40257 CVE-2025-40258 CVE-2025-40259                      CVE-2025-40261 CVE-2025-40262 CVE-2025-40263 CVE-2025-40264                      CVE-2025-40269 CVE-2025-40271 CVE-2025-40273 CVE-2025-40275                      CVE-2025-40277 CVE-2025-40278 CVE-2025-40280 CVE-2025-40281                      CVE-2025-40282 CVE-2025-40283 CVE-2025-40304 CVE-2025-40306                      CVE-2025-40308 CVE-2025-40309 CVE-2025-40312 CVE-2025-40315                      CVE-2025-40317 CVE-2025-40319 CVE-2025-40321 CVE-2025-40322                      CVE-2025-40324 CVE-2025-40331 CVE-2025-40342     Debian Bug     : 1107479 1114557

    Several vulnerabilities have been discovered in the Linux kernel that     may lead to a privilege escalation, denial of service or information     leaks.

    For Debian 11 bullseye, these problems have been fixed in version     5.10.247-1.  This version additionally includes many more bug fixes     from stable updates 5.10.245-5.10.247.  The broken pktcdvd driver has     also been disabled.

    We recommend that you upgrade your linux packages.

    For the detailed security status of linux please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/linux

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the linux package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - ACPI: video: Fix use-after-free in acpi_video_switch_brightness() The switch_brightness_work delayed work     accesses device->brightness and device->backlight, freed by acpi_video_dev_unregister_backlight() during     device removal. If the work executes after acpi_video_bus_unregister_backlight() frees these resources, it     causes a use-after-free when acpi_video_switch_brightness() dereferences device->brightness or     device->backlight. Fix this by calling cancel_delayed_work_sync() for each device's switch_brightness_work     in acpi_video_bus_remove_notify_handler() after removing the notify handler that queues the work. This     ensures the work completes before the memory is freed. [ rjw: Changelog edit ] (CVE-2025-40211)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
278559	Debian dla-4404 : ata-modules-5.10.0-35-armmp-di - security update	Nessus	Debian Local Security Checks	high
278313	Photon OS 4.0: Linux PHSA-2025-4.0-0924	Nessus	PhotonOS Local Security Checks	medium
278075	Photon OS 5.0: Linux PHSA-2025-5.0-0708	Nessus	PhotonOS Local Security Checks	high
276576	Linux Distros Unpatched Vulnerability : CVE-2025-40211	Nessus	Misc.	high

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