CVE-2023-53322

Host crash via premature remote-port cleanup

Published Sep 16, 2025 · Updated Sep 16, 2025

Use-after-free in Linux 2.6.34 through 6.4 allows remote attackers on the same Fibre Channel fabric to crash the host during port loss. The qla2xxx terminate_rport_io path returns before outstanding FCP-2 I/O reaches the upper layer, allowing cleanup to free resources still referenced by the driver. Reachability requires a qla2xxx Fibre Channel HBA, an FCP-2 target with outstanding I/O, and loss of its remote port; delayed I/O completion then causes the kernel crash.

CVSS severity8.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux 2.6.34 through 6.4 allows remote attackers on the same Fibre Channel fabric to crash the host during port loss. The qla2xxx terminate_rport_io path returns before outstanding FCP-2 I/O reaches the upper layer, allowing cleanup to free resources still referenced by the driver. Reachability requires a qla2xxx Fibre Channel HBA, an FCP-2 target with outstanding I/O, and loss of its remote port; delayed I/O completion then causes the kernel crash.

The record

CVE
CVE-2023-53322
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <079c8264ed9fea8cbcac01ad29040f901cbc3692
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4647d2e88918a078359d1532d90c417a38542c9e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5bcdaafd92be6035ddc77fa76650cf9dd5b864c4
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a55556cd7e0220486163b1285ce11a8be2ce5fa
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <90770dad1eb30967ebd8d37d82830bcf270b3293
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9fe97fb7b4ee21bffb76f2acb05769bad27ae70
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d25fded78d88e1515439b3ba581684d683e0b6ab
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc0cba0c7be8261a1625098bd1d695077ec621c9

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <079c8264ed9fea8cbcac01ad29040f901cbc3692; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4647d2e88918a078359d1532d90c417a38542c9e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5bcdaafd92be6035ddc77fa76650cf9dd5b864c4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a55556cd7e0220486163b1285ce11a8be2ce5fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <90770dad1eb30967ebd8d37d82830bcf270b3293; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9fe97fb7b4ee21bffb76f2acb05769bad27ae70; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d25fded78d88e1515439b3ba581684d683e0b6ab; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc0cba0c7be8261a1625098bd1d695077ec621c9

Published CVSS scores

8.8Linux kernel CVE teamCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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