CVE-2024-56683: drm/vc4: hdmi: Avoid hang with debug registers when suspended
In the Linux kernel, the following vulnerability has been resolved:
drm/vc4: hdmi: Avoid hang with debug registers when suspended
Trying to read /sys/kernel/debug/dri/1/hdmi1regs when the hdmi is disconnected results in a fatal system hang.
This is due to the pm suspend code disabling the dvp clock. That is just a gate of the 108MHz clock in DVPHTRPIMISCCONFIG, which results in accesses hanging AXI bus.
Protect against this.
Other sources
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— Launchpad
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-56683?
CVE-2024-56683 is considered a high severity vulnerability due to its potential to cause a fatal system hang.
How do I fix CVE-2024-56683?
To fix CVE-2024-56683, you should update your Linux kernel to the latest stable version that includes the security patch.
Which versions of Linux Kernel are affected by CVE-2024-56683?
CVE-2024-56683 affects all versions of the Linux kernel that include the vulnerable drm/vc4 HDMI code prior to the patch.
What are the potential consequences of CVE-2024-56683 if exploited?
Exploitation of CVE-2024-56683 can lead to a system hang when reading debug registers while the HDMI is disconnected.
Is there a workaround for CVE-2024-56683 before applying the patch?
A temporary workaround for CVE-2024-56683 is to avoid accessing the debug registers when the HDMI is disconnected.