# CVE-2021-47046: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/amd/display: Fix off by one in hdmi_14_proce...

CVE-2021-47046 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47046, released February 28, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47046
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 28, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47046](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47046.md) | Feb 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47046](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47046.md) | Feb 28, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47046](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47046.md) | Feb 28, 2024 |

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