CVE-2021-47642

Latent overflow via unchecked channel name copy

Published Feb 26, 2025 · Updated May 11, 2026

Buffer overflow in the nvidiafb I2C setup code in Linux allows attackers to cause unspecified impact via unspecified vectors. The static nvidia_setup_i2c_bus() function copies its name parameter into the 48-byte chan->adapter.name buffer with strcpy() and no length check. Linux kernel maintainers found no existing call site capable of supplying an overlong name, so the flawed copy is latent and no present exploit path or consequence is established.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the nvidiafb I2C setup code in Linux allows attackers to cause unspecified impact via unspecified vectors. The static nvidia_setup_i2c_bus() function copies its name parameter into the 48-byte chan->adapter.name buffer with strcpy() and no length check. Linux kernel maintainers found no existing call site capable of supplying an overlong name, so the flawed copy is latent and no present exploit path or consequence is established.

The record

CVE
CVE-2021-47642
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <055cdd2e7b992921424d4daaa285ced787fb205f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <08dff482012758935c185532b1ad7d584785a86e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37a1a2e6eeeb101285cd34e12e48a881524701aa
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <41baa86b6c802cdc6ab8ff2d46c083c9be93de81
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47e5533adf118afaf06d25a3e2aaaab89371b1c5
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <580e5d3815474b8349250c25c16416585a72c7fe
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a5226e544ac043bb2d8dc1bfe8920d02282f7cd
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <72dd5c46a152136712a55bf026a9aa8c1b12b60d
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9ff2f7294ab0f011cd4d1b7dcd9a07d8fdf72834
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <055cdd2e7b992921424d4daaa285ced787fb205f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <08dff482012758935c185532b1ad7d584785a86e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37a1a2e6eeeb101285cd34e12e48a881524701aa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <41baa86b6c802cdc6ab8ff2d46c083c9be93de81; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47e5533adf118afaf06d25a3e2aaaab89371b1c5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <580e5d3815474b8349250c25c16416585a72c7fe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a5226e544ac043bb2d8dc1bfe8920d02282f7cd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <72dd5c46a152136712a55bf026a9aa8c1b12b60d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9ff2f7294ab0f011cd4d1b7dcd9a07d8fdf72834; version=2.6.12

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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