CVE-2023-53056

System hang via out-of-order IOCB accounting

Published May 2, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux qla2xxx SCSI driver allows local users to hang affected systems during NVMe/FC teardown. The qla_nvme_ls_req path encounters out-of-order IOCB accounting, which blocks subsequent commands and reaches a null wake queue. Exploitation requires local low-privileged access and a host using the qla2xxx driver for an NVMe over Fibre Channel association; the bounded consequence is a host hang.

CVSS severity5.5
Medium
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

NULL pointer dereference in the Linux qla2xxx SCSI driver allows local users to hang affected systems during NVMe/FC teardown. The qla_nvme_ls_req path encounters out-of-order IOCB accounting, which blocks subsequent commands and reaches a null wake queue. Exploitation requires local low-privileged access and a host using the qla2xxx driver for an NVMe over Fibre Channel association; the bounded consequence is a host hang.

The record

CVE
CVE-2023-53056
Published
May 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 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

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=5.15.99 <5.15.105
  2. Affected versionversion=5f63a163ed2f12c34dd4ae9b2757962ec7bb86e5 <d3affdeb400f3adc925bd996f3839481f5291839
  3. Affected versionversion=6.1.16 <6.1.22
  4. Affected versionversion=6.2.3 <6.2.9
  5. Affected versionversion=6626b7494a01561fe5151fa6976875014a343a14 <6d57b77d7369ed73836c82b25f785b34923eef84
  6. Affected versionversion=d58b45bbbea8f9516b66e0b494701c369adb0ae8 <6295b3ec64a3623fa96869ffb7cf17d0b3c92035
  7. Affected versionversion=f2dde125ae9849b84f46a98abd98f655148821ab <ffd7831841d3c56c655531fc8c5acafaaf20e1bb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.99 <5.15.105; version=5f63a163ed2f12c34dd4ae9b2757962ec7bb86e5 <d3affdeb400f3adc925bd996f3839481f5291839; version=6.1.16 <6.1.22; version=6.2.3 <6.2.9; version=6626b7494a01561fe5151fa6976875014a343a14 <6d57b77d7369ed73836c82b25f785b34923eef84; version=d58b45bbbea8f9516b66e0b494701c369adb0ae8 <6295b3ec64a3623fa96869ffb7cf17d0b3c92035; version=f2dde125ae9849b84f46a98abd98f655148821ab <ffd7831841d3c56c655531fc8c5acafaaf20e1bb

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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
T1499Endpoint Denial of Service

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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