7.8

CVE-2021-47046: drm/amd/display: Fix off by one in hdmi_14_process_transaction()

Analyzed
AliasesUBUNTU-CVE-2021-47046DEBIAN-CVE-2021-47046
Published 28-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47046 is a high (CVSS 7.8) Off-by-one Error vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1

Timeline

  1. 28-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu62 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 4c283fdac08abf3211533f70623c90a34f41d08d, < 403c4528e5887af3deb9838cb77a557631d1e138 | ≥ 4c283fdac08abf3211533f70623c90a34f41d08d, < 6a58310d5d1e5b02d0fc9b393ba540c9367bced5 | ≥ 4c283fdac08abf3211533f70623c90a34f41d08d, < 080bd41d6478a64edf96704fddcda52b1fd5fed7 | ≥ 4c283fdac08abf3211533f70623c90a34f41d08d, < 8e6fafd5a22e7a2eb216f5510db7aab54cc545c1 | 5.5
  • linux_kernel≥ 5.5, < 5.10.37 | ≥ 5.11, < 5.11.21 | ≥ 5.12, < 5.12.4
Debian1 product
  • linux< 5.10.38-1

3 vendors · 65 products

References

8 links