NULL pointer dereference in amdgpu_dm_connector_add_common_modes() in Kernel
Summary
GSD-2022-1001551: drm/amd/display: Fix a NULL pointer dereference in amdgpu_dm_connector_add_common_modes(). Affects Kernel versions >= e7b07ceef2a650e5ed8ca37997689e086c680daf, < f4eaa999fec78dec2a9c2d797438e05cbffb125b. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software. It is crucial for the proper functioning of the system. The amdgpu_dm_connector_add_common_modes() function is part of the display subsystem in the Kernel, specifically in the drm/amd/display module. This function is responsible for adding common display modes to an AMD GPU connector. A NULL pointer dereference vulnerability has been identified in this function.
Vulnerability Detail
The NULL pointer dereference vulnerability in amdgpu_dm_connector_add_common_modes() occurs when a NULL pointer is accessed, leading to a system crash or potential privilege escalation. An attacker could exploit this vulnerability by sending specially crafted input to a vulnerable system, causing the function to dereference a NULL pointer. This could result in a denial of service (system crash) or potentially allow an attacker to execute arbitrary code with elevated privileges. The vulnerability was introduced in version v4.15 of the Linux Kernel and has been fixed in version v5.16.19.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a possible workaround is to disable the affected functionality. This can be achieved by blacklisting the amdgpu module or preventing the loading of the module at system startup. However, this workaround may result in the loss of display capabilities for AMD GPUs.
Conclusion
The NULL pointer dereference vulnerability in amdgpu_dm_connector_add_common_modes() in the Kernel can lead to system crashes or potential privilege escalation. It is crucial to update the Linux Kernel to version v5.16.19 or later to mitigate this vulnerability. If immediate updating is not possible, a temporary workaround is available by disabling the affected functionality. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a system crash (denial of service) or potential privilege escalation, allowing an attacker to execute arbitrary code with elevated privileges.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze the dependencies and alert you if any vulnerabilities are found.
Yes, the vulnerability has been fixed in version v5.16.19 of the Linux Kernel. It is recommended to update to this version or a later one to mitigate the risk.
A temporary workaround is to disable the affected functionality by blacklisting the amdgpu module or preventing its loading at system startup. However, this may result in the loss of display capabilities for AMD GPUs.
You can find more information about this vulnerability in the GSD-2022-1001551 entry of the GSD Database maintained by the Cloud Security Alliance. The entry provides details about the vulnerability, its impact, and the fix.
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