# CVE-2024-46698: video/aperture: optionally match the device in sysfb_disable()

CVE-2024-46698 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-46698, released September 13, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-46698
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 13, 2024
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-46698

## Description

In the Linux kernel, the following vulnerability has been resolved:  video/aperture: optionally match the device in sysfb_disable()  In aperture_remove_conflicting_pci_devices(), we currently only call sysfb_disable() on vga class devices.  This leads to the following problem when the pimary device is not VGA compatible:  1. A PCI device with a non-VGA class is the boot display 2. That device is probed first and it is not a VGA device so    sysfb_disable() is not called, but the device resources    are freed by aperture_detach_platform_device() 3. Non-primary GPU has a VGA class and it ends up calling sysfb_disable() 4. NULL pointer dereference via sysfb_disable() since the resources    have already been freed by aperture_detach_platform_device() when    it was called by the other device.  Fix this by passing a device pointer to sysfb_disable() and checking the device to determine if we should execute it or not.  v2: Fix build when CONFIG_SCREEN_INFO is not set v3: Move device check into the mutex     Drop primary variable in aperture_remove_conflicting_pci_devices()     Drop __init on pci sysfb_pci_dev_is_enabled()

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.9-1 | [DEBIAN-CVE-2024-46698](https://patchblox.com/security/data/fix/linux/debian-cve-2024-46698.md) | Sep 13, 2024 |
| Linux | linux Debian 14 | 6.10.9-1 | [DEBIAN-CVE-2024-46698](https://patchblox.com/security/data/fix/linux/debian-cve-2024-46698.md) | Sep 13, 2024 |

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