CVE-2021-47046: drm/amd/display: Fix off by one in hdmi_14_process_transaction()
First published: Wed Feb 28 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix off by one in hdmi_14_process_transaction() The hdcp_i2c_offsets[] array did not have an entry for HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE so it led to an off by one read overflow. I added an entry and copied the 0x0 value for the offset from similar code in drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c. I also declared several of these arrays as having HDCP_MESSAGE_ID_MAX entries. This doesn't change the code, but it's just a belt and suspenders approach to try future proof the code.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.5<5.10.37 | |
| Linux Kernel | >=5.11<5.11.21 | |
| Linux Kernel | >=5.12<5.12.4 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47046?
CVE-2021-47046 is classified as a medium severity vulnerability.
How do I fix CVE-2021-47046?
To fix CVE-2021-47046, update your Linux kernel to a version above 5.10.37, 5.11.21, or 5.12.4.
Which versions of the Linux kernel are affected by CVE-2021-47046?
CVE-2021-47046 affects Linux kernel versions from 5.5 to 5.10.37, 5.11 to 5.11.21, and 5.12 to 5.12.4.
What kind of vulnerability is CVE-2021-47046?
CVE-2021-47046 is an off-by-one read overflow vulnerability in the Linux kernel's HDMI processing.
What component of the Linux kernel is affected by CVE-2021-47046?
CVE-2021-47046 specifically affects the drm/amd/display component of the Linux kernel.
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