PT-2021-8131 · Linux+2 · Linux Kernel+2
Angelogioacchino Del Regno
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Published
2021-12-13
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Updated
2025-01-07
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CVE-2021-47108
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue is related to a NULL pointer dereference in the mediatek component of the Linux kernel, specifically in the
mtk hdmi bridge mode valid() function. This occurs when a HDMI cable is plugged in and the kernel attempts to access the mtk hdmi conf structure, which is not provided by MT8173, leading to a kernel crash. The problem was introduced by commits that added checks for CEA modes and maximal HDMI mode clock. To fix this regression, a NULL pointer check for hdmi->conf needs to be added to the mtk hdmi bridge mode valid() function to restore HDMI functionality and prevent NULL pointer kernel panics.Recommendations
To resolve the issue, add a NULL pointer check for
hdmi->conf in the mtk hdmi bridge mode valid() function. This will restore HDMI functionality and avoid NULL pointer kernel panics. As a temporary workaround, consider disabling the mtk hdmi bridge mode valid() function until a patch is available. Restrict access to the vulnerable drm/mediatek module to minimize the risk of exploitation. Avoid using the hdmi->conf structure in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Red Os
Suse