AZL-49278
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-49278.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-49278
- Upstream
- Published
- 2024-09-13T06:15:14Z
- Modified
- 2026-04-01T05:16:09.751848Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2024-46698 affecting package kernel 6.6.126.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
video/aperture: optionally match the device in sysfb_disable()
In apertureremoveconflictingpcidevices(), we currently only call sysfb_disable() on vga class devices. This leads to the following problem when the pimary device is not VGA compatible:
- A PCI device with a non-VGA class is the boot display
- That device is probed first and it is not a VGA device so sysfbdisable() is not called, but the device resources are freed by aperturedetachplatformdevice()
- Non-primary GPU has a VGA class and it ends up calling sysfb_disable()
- NULL pointer dereference via sysfbdisable() since the resources have already been freed by aperturedetachplatformdevice() 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 CONFIGSCREENINFO is not set v3: Move device check into the mutex Drop primary variable in apertureremoveconflictingpcidevices() Drop __init on pci sysfbpcidevisenabled()
- References