CVE-2023-54320

Kernel memory exhaustion via failed STB command

Published Dec 30, 2025 · Updated Dec 30, 2025

Memory leak in the AMD PMC STB debugfs handler in Linux 6.3 through 6.3.3 allows local users to consume kernel memory. The amd_pmc_stb_debugfs_open_v2 function allocates buf but returns without freeing it when amd_pmc_send_cmd fails. The STB debug mechanism must be enabled, and debugfs is root-accessible by default; each failed open retains one kernel allocation.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
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 AMD PMC STB debugfs handler in Linux 6.3 through 6.3.3 allows local users to consume kernel memory. The amd_pmc_stb_debugfs_open_v2 function allocates buf but returns without freeing it when amd_pmc_send_cmd fails. The STB debug mechanism must be enabled, and debugfs is root-accessible by default; each failed open retains one kernel allocation.

The record

CVE
CVE-2023-54320
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d804adef7b23b22bb82e1b3dd113e9073cea9bc1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6e7ac4c35a28aef0be93b32c533ae678ad0b9e7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d804adef7b23b22bb82e1b3dd113e9073cea9bc1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6e7ac4c35a28aef0be93b32c533ae678ad0b9e7

Published CVSS scores

No CVSS assessment is available in this record.

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
Privilegesadmin
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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