Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2021-47658
CVE-2021-47658:
Linux Debian vulnerability analysis and mitigation
Overview
CVE-2021-47658 affects the Linux kernel's AMD GPU driver, specifically related to memory management in the DRM (Direct Rendering Manager) subsystem. The vulnerability was discovered in the AMD PowerPlay component, where a potential memory leak exists in the gpumetricstable allocation within the Renoir GPU support implementation (Kernel Git).
Technical details
The vulnerability stems from memory being allocated for gpumetricstable in the renoirinitsmctables() function but not being properly freed in smuv120finismctables(). This issue was introduced in commit 95868b85764a which added Renoir support for GPU metrics export (Kernel Git).
Impact
The memory leak could potentially lead to resource exhaustion over time in systems running affected versions of the Linux kernel with AMD Renoir GPUs. This may result in degraded system performance or stability issues (Ubuntu Security).
Mitigation and workarounds
The issue has been fixed by adding proper memory deallocation code in the smuv120finismctables() function. The fix involves adding 'kfree(smutable->gpumetricstable)' and setting the pointer to NULL. Users should update to patched kernel versions that include this fix (Kernel Git).
Additional resources
Source: This report was generated using AI
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