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NVD / CVE Program· CNA Linux

CVE-2021-47348: drm/amd/display: Avoid HDCP over-read and corruption

Noroxi assessment

Priority: Monitor (action score 36/100)

  • 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: 0.98% (FIRST EPSS); higher than 62.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 06888d571b513cbfc0b41949948def6cb81021b2, 3b2b93a485fb7a970bc8b5daef16f4cf579d172f, 44c7c901cb368a9f2493748f213b247b5872639f.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 06888d571b513cbfc0b41949948def6cb81021b2, 3b2b93a485fb7a970bc8b5daef16f4cf579d172f, 44c7c901cb368a9f2493748f213b247b5872639f 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: Avoid HDCP over-read and corruption Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
May 21, 2024
Updated
Jun 17, 2026
EPSS
0.9% · 62th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
yes
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-2021-47348

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

Affected versions

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

  • linux linux kernelbefore 5.10.51
  • linux linux kernel5.11 and later · before 5.12.18
  • linux linux kernel5.13 and later · before 5.13.3

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 c5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2eaffected · git
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 44c7c901cb368a9f2493748f213b247b5872639faffected · git
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 3b2b93a485fb7a970bc8b5daef16f4cf579d172faffected · git
    • 4c283fdac08abf3211533f70623c90a34f41d08d and later · before 06888d571b513cbfc0b41949948def6cb81021b2affected · git
    • before 5.5not affected · semver
    • 5.10.51 and later · up to and including 5.10.*not affected · semver
    • 5.12.18 and later · up to and including 5.12.*not affected · semver
    • 5.13.3 and later · up to and including 5.13.*not affected · semver
    • 5.14 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.6-15.14.6-1

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-2021-47346May 21, 2024 · coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()
    28Monitor
  • ← EarlierCVE-2021-47347May 21, 2024 · wl1251: Fix possible buffer overflow in wl1251_cmd_scan
    31Monitor
  • Later →CVE-2021-47349May 21, 2024 · mwifiex: bring down link before deleting interface
    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 Linux06888d571b513cbfc0b41949948def6cb81021b2Vendor (CNA)
Linux Linux3b2b93a485fb7a970bc8b5daef16f4cf579d172fVendor (CNA)
Linux Linux44c7c901cb368a9f2493748f213b247b5872639fVendor (CNA)
Linux Linuxc5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2eVendor (CNA)
debian:linux5.14.6-1 · 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

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

  • CVE-2023-5244090 days apartksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
    38Monitor
  • CVE-2023-5243491 days apartsmb: client: fix potential OOBs in smb2_parse_contexts()
    32Monitor
  • CVE-2022-4865523 days apartfirmware: arm_scmi: Harden accesses to the reset domains
    31Monitor
  • CVE-2022-4866223 days apartdrm/i915/gem: Really move i915_gem_context.link under ref protection
    31Monitor
  • CVE-2024-2688334 days apartbpf: Fix stackmap overflow check on 32-bit arches
    31Monitor
  • CVE-2024-2688534 days apartbpf: Fix DEVMAP_HASH overflow check on 32-bit arches
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

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

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

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

All records