CVE-2023-54209

Debugfs entry leak via late blktrace enablement

Published Dec 30, 2025 · Updated Dec 30, 2025

Resource leak in the Linux kernel block layer allows local users to leave stale blktrace debugfs entries through an ioctl sequence. blk_unregister_queue can run before a later BLKTRACESETUP ioctl, so closing the already-open disk omits blk_trace_shutdown and leaves per-disk entries behind. The trigger requires a disk opened before del_gendisk, blktrace enabled afterward, and closure without explicit trace shutdown; the published consequence is limited to leaked debugfs entries.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel block layer allows local users to leave stale blktrace debugfs entries through an ioctl sequence. blk_unregister_queue can run before a later BLKTRACESETUP ioctl, so closing the already-open disk omits blk_trace_shutdown and leaves per-disk entries behind. The trigger requires a disk opened before del_gendisk, blktrace enabled afterward, and closure without explicit trace shutdown; the published consequence is limited to leaked debugfs entries.

The record

CVE
CVE-2023-54209
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

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=5.19
  2. Affected versionversion=99d055b4fd4bbb309c6cdb51a0d420669f777944 <7149e57cf01184fba175589f8fbe9fbf33be02e1
  3. Affected versionversion=99d055b4fd4bbb309c6cdb51a0d420669f777944 <942e81650b81b4ca62f1d8c61de455c9e7c7e6ca
  4. Affected versionversion=99d055b4fd4bbb309c6cdb51a0d420669f777944 <aa07e56c6a9c7558165690d14eed4fe8babf34fb
  5. Affected versionversion=99d055b4fd4bbb309c6cdb51a0d420669f777944 <dd7de3704af9989b780693d51eaea49a665bd9c2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=99d055b4fd4bbb309c6cdb51a0d420669f777944 <7149e57cf01184fba175589f8fbe9fbf33be02e1; version=99d055b4fd4bbb309c6cdb51a0d420669f777944 <942e81650b81b4ca62f1d8c61de455c9e7c7e6ca; version=99d055b4fd4bbb309c6cdb51a0d420669f777944 <aa07e56c6a9c7558165690d14eed4fe8babf34fb; version=99d055b4fd4bbb309c6cdb51a0d420669f777944 <dd7de3704af9989b780693d51eaea49a665bd9c2

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
PrivilegesUnavailable
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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