CVE-2021-47046

drm/amd/display: Fix off by one in hdmi_14_process_transaction()

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.02%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/403c4528e5887af3deb9838cb77a557631d1e138 patch
https://git.kernel.org/stable/c/6a58310d5d1e5b02d0fc9b393ba540c9367bced5 patch
https://git.kernel.org/stable/c/080bd41d6478a64edf96704fddcda52b1fd5fed7 patch
https://git.kernel.org/stable/c/8e6fafd5a22e7a2eb216f5510db7aab54cc545c1 patch

Frequently Asked Questions

What is the severity of CVE-2021-47046?
CVE-2021-47046 has been scored as a high severity vulnerability.
How to fix CVE-2021-47046?
To fix CVE-2021-47046, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47046 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47046 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47046?
CVE-2021-47046 affects Linux Linux, Linux Linux.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.