CVE-2021-47431

Service interruption via leaked GART pin references

Published May 21, 2024 · Updated Aug 11, 2026

A resource leak in the Linux kernel amdgpu driver allows local users to retain pinned GPU memory when an SR-IOV virtual function unloads. In gmc_v9_0_hw_fini() and gmc_v10_0_hw_fini(), the SR-IOV early return skips gmc_v*_0_gart_disable(), so the matching unpin operation never decrements gart.bo pin_count. Exploitation requires an affected AMD GPU in SR-IOV virtual-function mode; repeated unloads consume pinned resources and can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A resource leak in the Linux kernel amdgpu driver allows local users to retain pinned GPU memory when an SR-IOV virtual function unloads. In gmc_v9_0_hw_fini() and gmc_v10_0_hw_fini(), the SR-IOV early return skips gmc_v*_0_gart_disable(), so the matching unpin operation never decrements gart.bo pin_count. Exploitation requires an affected AMD GPU in SR-IOV virtual-function mode; repeated unloads consume pinned resources and can interrupt service.

The record

CVE
CVE-2021-47431
Published
May 21, 2024
Updated
Aug 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.13
  2. Affected versionversion=5dd696ae5d648b412a29b314c50e5dcf65829b9d <18d1c5ea3798ba42cfa0f8b2264d873463facb03
  3. Affected versionversion=5dd696ae5d648b412a29b314c50e5dcf65829b9d <621ddffb70db824eabd63d18ac635180fe9500f9
  4. Affected versionversion=5dd696ae5d648b412a29b314c50e5dcf65829b9d <66805763a97f8f7bdf742fc0851d85c02ed9411f
  5. Affected versionversion=5dd696ae5d648b412a29b314c50e5dcf65829b9d <83d857d6b0967b6709cd38750c3ce2ed8ced1a95

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=5dd696ae5d648b412a29b314c50e5dcf65829b9d <18d1c5ea3798ba42cfa0f8b2264d873463facb03; version=5dd696ae5d648b412a29b314c50e5dcf65829b9d <621ddffb70db824eabd63d18ac635180fe9500f9; version=5dd696ae5d648b412a29b314c50e5dcf65829b9d <66805763a97f8f7bdf742fc0851d85c02ed9411f; version=5dd696ae5d648b412a29b314c50e5dcf65829b9d <83d857d6b0967b6709cd38750c3ce2ed8ced1a95

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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