CVE-2023-52693: ACPI: video: check for error while searching for backlight device parent

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-17 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: video: check for error while searching for backlight device parent If acpi_get_parent() called in acpi_video_dev_register_backlight() fails, for example, because acpi_ut_acquire_mutex() fails inside acpi_get_parent), this can lead to incorrect (uninitialized) acpi_parent handle being passed to acpi_get_pci_dev() for detecting the parent pci device. Check acpi_get_parent() result and set parent device only in case of success. Found by Linux Verification Center (linuxtesting.org) with SVACE.

Affected products

Debian Linux: 10.0
Linux kernel: from 2.6.39 before 4.19.306; from 4.20 before 5.4.268; from 5.5 before 5.10.209; from 5.11 before 5.15.148; from 5.16 before 6.1.75; from 6.2 before 6.6.14 — fixed in 4.19.306, 5.10.209, 5.15.148, 5.4.268, 6.1.75, 6.6.14

How to fix

Upgrade to a fixed version: Linux kernel 4.19.306, 5.10.209, 5.15.148, 5.4.268. Check the vendor advisory for mitigations.

References

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