CVE-2021-47046

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4c283fdac08abf3211533f70623c90a34f41d08d < 403c4528e5887af3deb9838cb77a557631d1e138affected
LinuxLinux4c283fdac08abf3211533f70623c90a34f41d08d < 6a58310d5d1e5b02d0fc9b393ba540c9367bced5affected
LinuxLinux4c283fdac08abf3211533f70623c90a34f41d08d < 080bd41d6478a64edf96704fddcda52b1fd5fed7affected
LinuxLinux4c283fdac08abf3211533f70623c90a34f41d08d < 8e6fafd5a22e7a2eb216f5510db7aab54cc545c1affected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux5.10.37 <= 5.10.*unaffected
LinuxLinux5.11.21 <= 5.11.*unaffected
LinuxLinux5.12.4 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References