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NVD / CVE Program· CNA Linux

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

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 080bd41d6478a64edf96704fddcda52b1fd5fed7, 403c4528e5887af3deb9838cb77a557631d1e138, 6a58310d5d1e5b02d0fc9b393ba540c9367bced5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 080bd41d6478a64edf96704fddcda52b1fd5fed7, 403c4528e5887af3deb9838cb77a557631d1e138, 6a58310d5d1e5b02d0fc9b393ba540c9367bced5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Feb 28, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-47046

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.5affected
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 403c4528e5887af3deb9838cb77a557631d1e138affected · git
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 6a58310d5d1e5b02d0fc9b393ba540c9367bced5affected · git
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 080bd41d6478a64edf96704fddcda52b1fd5fed7affected · git
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 8e6fafd5a22e7a2eb216f5510db7aab54cc545c1affected · git
    • before 5.5not affected · semver
    • 5.10.37 and later · up to and including 5.10.*not affected · semver
    • 5.11.21 and later · up to and including 5.11.*not affected · semver
    • 5.12.4 and later · up to and including 5.12.*not affected · semver
    • 5.13 and laternot affected · original_commit_for_fix

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.5 and later · before 5.10.37
  • linux linux kernel5.11 and later · before 5.11.21
  • linux linux kernel5.12 and later · before 5.12.4

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.10.38-15.10.38-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-47044Feb 28, 2024 · sched/fair: Fix shift-out-of-bounds in load_balance()
    30Monitor
  • ← EarlierCVE-2021-47045Feb 28, 2024 · scsi: lpfc: Fix null pointer dereference in lpfc_prep_els_iocb()
    22Monitor
  • Later →CVE-2021-47047Feb 28, 2024 · spi: spi-zynqmp-gqspi: return -ENOMEM if dma_map_single fails
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux080bd41d6478a64edf96704fddcda52b1fd5fed7Vendor (CNA)
Linux Linux403c4528e5887af3deb9838cb77a557631d1e138Vendor (CNA)
Linux Linux6a58310d5d1e5b02d0fc9b393ba540c9367bced5Vendor (CNA)
Linux Linux8e6fafd5a22e7a2eb216f5510db7aab54cc545c1Vendor (CNA)
debian:linux5.10.38-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-38429226 days apartAn issue was discovered in the Linux kernel before 6.3.4.
    39Monitor
  • CVE-2024-2699563 days apartusb: typec: tcpm: Correct the PDO counting in pd_set
    31Monitor
  • CVE-2022-4867265 days apartof: fdt: fix off-by-one error in unflatten_dt_nodes()
    31Monitor
  • CVE-2022-48732113 days apartdrm/nouveau: fix off by one in BIOS boundary checking
    31Monitor
  • CVE-2024-43852171 days aparthwmon: (ltc2991) re-order conditions to fix off by one bug
    31Monitor
  • CVE-2024-46852212 days apartdma-buf: heaps: Fix off-by-one in CMA heap fault handler
    31Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-193 · Off-by-one Error

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records