CVE-2023-53814

Kernel memory leak via zero-ended PCI resource rejection

Published Dec 9, 2025 · Updated May 11, 2026

Resource management error in the Linux PCI host-bridge setup leaks kernel memory when a valid root bus resource ends at zero. The resource-filtering path tests only resource.end, so it discards the valid range instead of requiring flags, start, and end all to be zero. The demonstrated condition occurs during PCI initialization on r8a7791/koelsch hardware, where the bus range is not registered and its 64-byte entry remains unreferenced.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource management error in the Linux PCI host-bridge setup leaks kernel memory when a valid root bus resource ends at zero. The resource-filtering path tests only resource.end, so it discards the valid range instead of requiring flags, start, and end all to be zero. The demonstrated condition occurs during PCI initialization on r8a7791/koelsch hardware, where the bus range is not registered and its 64-byte entry remains unreferenced.

The record

CVE
CVE-2023-53814
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 9, 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

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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=5.16
  2. Affected versionversion=7c3855c423b17f6ca211858afb0cef20569914c7 <7e6f2714d93cdf977b6124a80af2cf0e14e2d407
  3. Affected versionversion=7c3855c423b17f6ca211858afb0cef20569914c7 <9d8ba74a181b1c81def21168795ed96cbe6f05ed
  4. Affected versionversion=7c3855c423b17f6ca211858afb0cef20569914c7 <fe6a1fbe83f5b23d7db93596b793561230f06b40
  5. Affected versionversion=fd168b7d1d7cfc61cea561b1e3cc47aefc9e8f19 <e4af080f3ef6a65b0d702988c2471a47c9ae2cc0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=7c3855c423b17f6ca211858afb0cef20569914c7 <7e6f2714d93cdf977b6124a80af2cf0e14e2d407; version=7c3855c423b17f6ca211858afb0cef20569914c7 <9d8ba74a181b1c81def21168795ed96cbe6f05ed; version=7c3855c423b17f6ca211858afb0cef20569914c7 <fe6a1fbe83f5b23d7db93596b793561230f06b40; version=fd168b7d1d7cfc61cea561b1e3cc47aefc9e8f19 <e4af080f3ef6a65b0d702988c2471a47c9ae2cc0

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)
VectorUnavailable
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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