CVE-2021-47550

Kernel memory exhaustion via unreleased XGMI kobject

Published May 24, 2024 · Updated May 11, 2026

Memory leak in the AMDGPU XGMI subsystem in affected Linux kernels allows local users to exhaust kernel memory after hive setup failures. The amdgpu_get_xgmi_hive error path omits kobject_put when kobject_init_and_add fails, leaving the initialized hive kobject referenced. Reachability requires XGMI hive setup to encounter kobject creation failure; published material does not establish that local users can force that condition.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the AMDGPU XGMI subsystem in affected Linux kernels allows local users to exhaust kernel memory after hive setup failures. The amdgpu_get_xgmi_hive error path omits kobject_put when kobject_init_and_add fails, leaving the initialized hive kobject referenced. Reachability requires XGMI hive setup to encounter kobject creation failure; published material does not establish that local users can force that condition.

The record

CVE
CVE-2021-47550
Published
May 24, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2024CVE 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=5.10
  2. Affected versionversion=d95e8e97e2d522b7ebb1d5a64c01d8de307621dc <27dfaedc0d321b4ea4e10c53e4679d6911ab17aa
  3. Affected versionversion=d95e8e97e2d522b7ebb1d5a64c01d8de307621dc <75752ada77e0726327adf68018b9f50ae091baeb
  4. Affected versionversion=d95e8e97e2d522b7ebb1d5a64c01d8de307621dc <c746945fb6bcbe3863c9ea6369c7ef376e38e5eb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=d95e8e97e2d522b7ebb1d5a64c01d8de307621dc <27dfaedc0d321b4ea4e10c53e4679d6911ab17aa; version=d95e8e97e2d522b7ebb1d5a64c01d8de307621dc <75752ada77e0726327adf68018b9f50ae091baeb; version=d95e8e97e2d522b7ebb1d5a64c01d8de307621dc <c746945fb6bcbe3863c9ea6369c7ef376e38e5eb

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-401Missing Release of Memory after Effective Lifetime

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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