CVE-2023-52771

Kernel crash via CXL parent teardown race

Published May 21, 2024 · Updated May 11, 2026

A race condition in Linux kernel CXL port teardown allows local users to crash systems running 5.18 through 6.5.12 or 6.6 through 6.6.2. delete_endpoint locks a parent without first retaining it, permitting concurrent unregistration to free the parent; RCH handling can also select the wrong parent. Reachability requires local access and a concurrent CXL port or memory-device removal, resulting in a kernel fault and service interruption.

CVSS severity4.7
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux kernel CXL port teardown allows local users to crash systems running 5.18 through 6.5.12 or 6.6 through 6.6.2. delete_endpoint locks a parent without first retaining it, permitting concurrent unregistration to free the parent; RCH handling can also select the wrong parent. Reachability requires local access and a concurrent CXL port or memory-device removal, resulting in a kernel fault and service interruption.

The record

CVE
CVE-2023-52771
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.18
  2. Affected versionversion=8dd2bc0f8e02d39bd80851ca787bcbdb7d495e69 <37179fcc916bce8c3cc7b36d67ef814cce55142b
  3. Affected versionversion=8dd2bc0f8e02d39bd80851ca787bcbdb7d495e69 <6b2e428e673b3f55965674a426c40922e91388aa
  4. Affected versionversion=8dd2bc0f8e02d39bd80851ca787bcbdb7d495e69 <8d2ad999ca3c64cb08cf6a58d227b9d9e746d708

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=8dd2bc0f8e02d39bd80851ca787bcbdb7d495e69 <37179fcc916bce8c3cc7b36d67ef814cce55142b; version=8dd2bc0f8e02d39bd80851ca787bcbdb7d495e69 <6b2e428e673b3f55965674a426c40922e91388aa; version=8dd2bc0f8e02d39bd80851ca787bcbdb7d495e69 <8d2ad999ca3c64cb08cf6a58d227b9d9e746d708

Published CVSS scores

4.7NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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