Memory Leak in drm/selftests/test-drm_dp_mst_helper
Summary
GSD-2022-1001865: drm/selftests/test-drm_dp_mst_helper: Fix memory leak in sideband_msg_req_encode_decode. Affects Kernel versions >= 09234b88ef5598252d1cee37e4d7b26a48b6557f, < 0728ccb66468b7a59959f9f4fb518ff9c655485f. No fix is published. How to fix ↓
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Background
The drm/selftests/test-drm_dp_mst_helper is a self-test module in the Linux Kernel that is responsible for testing the functionality of the DisplayPort Multi-Stream Transport (DP MST) helper. DP MST is a feature that allows multiple displays to be connected to a single DisplayPort output. The test-drm_dp_mst_helper module is used to verify the correct operation of the DP MST helper functions. However, a memory leak vulnerability has been discovered in the sideband_msg_req_encode_decode function of this module.
Vulnerability Detail
The sideband_msg_req_encode_decode function in drm/selftests/test-drm_dp_mst_helper is vulnerable to a memory leak. This vulnerability can be exploited by an attacker to exhaust system memory resources, leading to a denial of service condition. The function fails to release allocated memory when an error occurs during the encoding or decoding of sideband messages. As a result, memory resources are not properly freed, causing a gradual depletion of available memory over time. This can eventually lead to system instability or crashes.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix by updating the Linux Kernel to a version that includes the patch.
Conclusion
The memory leak vulnerability in the sideband_msg_req_encode_decode function of drm/selftests/test-drm_dp_mst_helper can lead to a gradual depletion of system memory resources, potentially causing system instability or crashes. It is recommended to update the Linux Kernel to version v5.15.33 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can lead to a gradual depletion of system memory resources, potentially causing system instability or crashes.
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 known vulnerabilities are present.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the fix as soon as possible to prevent potential attacks.
No, this vulnerability requires local access to the system in order to exploit it.
The only mitigation for this vulnerability is to update the Linux Kernel to a version that includes the fix.
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