CVE-2023-52508

Local system crash via null AEN request

Published Mar 2, 2024 · Updated May 23, 2026

Null pointer dereference in the Linux kernel allows local users to crash the system through an NVMe over Fibre Channel AEN operation. The nvme_fc_io_getuuid function dereferences the request pointer in an nvme_fc_fcp_op even though AEN operations initialize that pointer to null. Exploitation requires low-privileged local access and an FC low-level driver that passes the AEN request, and the resulting impact is limited to system availability.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in the Linux kernel allows local users to crash the system through an NVMe over Fibre Channel AEN operation. The nvme_fc_io_getuuid function dereferences the request pointer in an nvme_fc_fcp_op even though AEN operations initialize that pointer to null. Exploitation requires low-privileged local access and an FC low-level driver that passes the AEN request, and the resulting impact is limited to system availability.

The record

CVE
CVE-2023-52508
Published
Mar 2, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.18.18 <5.19
  2. Affected versionversion=5.19
  3. Affected versionversion=7a41fdf27a4b1ee565ce5bf3e409b2df0b8514c4
  4. Affected versionversion=827fc630e4c8087df5a8e8ee013b686bd6f13736 <8ae5b3a685dc59a8cf7ccfe0e850999ba9727a3c
  5. Affected versionversion=827fc630e4c8087df5a8e8ee013b686bd6f13736 <be90c9e29dd59b7d19a73297a1590ff3ec1d22ea
  6. Affected versionversion=827fc630e4c8087df5a8e8ee013b686bd6f13736 <dd46b3ac7322baf3772b33b29726e94f98289db7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18.18 <5.19; version=5.19; version=7a41fdf27a4b1ee565ce5bf3e409b2df0b8514c4; version=827fc630e4c8087df5a8e8ee013b686bd6f13736 <8ae5b3a685dc59a8cf7ccfe0e850999ba9727a3c; version=827fc630e4c8087df5a8e8ee013b686bd6f13736 <be90c9e29dd59b7d19a73297a1590ff3ec1d22ea; version=827fc630e4c8087df5a8e8ee013b686bd6f13736 <dd46b3ac7322baf3772b33b29726e94f98289db7

Published CVSS scores

5.5CISA-ADPCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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