Memory Read Out-of-Bounds in Linux Kernel HDMI Connector

Executive Summary

This is a vulnerability in the Linux kernel where a helper function incorrectly copies an audio infoframe into a connector's buffer. It uses the destination size (60 bytes) instead of the source size (28 bytes), causing an out-of-bounds memory read. The issue was detected using KASAN during KUnit tests but is unlikely to cause real-world problems as it only reads memory and cannot corrupt it.

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Detection Guidance

This vulnerability is specific to the Linux kernel's DRM subsystem and involves an out-of-bounds memory read in HDMI audio infoframe handling. Detection requires checking kernel logs for KASAN or similar memory error reports, or verifying if your kernel version includes the fix. No direct network detection commands are applicable.

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Impact Analysis

In practice, the impact is likely minimal. Since it only reads memory and cannot corrupt it, it may not directly affect users. However, in rare cases, it could cause an access violation if the read falls off the end of a memory page.

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Mitigation Strategies

Update your Linux kernel to a version that includes the fix for this vulnerability. Monitor kernel security advisories and apply patches promptly. No additional mitigation steps are required beyond standard kernel updates.

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