CVE-2023-53358Network attack vector

Authenticated kernel code execution via concurrent tree disconnects

Published Sep 17, 2025 · Updated Sep 17, 2025

A use-after-free in the Linux ksmbd SMB server allows remote authenticated users to execute kernel code via concurrent tree disconnects. Concurrent SMB2_TREE_DISCONNECT handlers can obtain the same tree connection, after which one handler uses and frees state already released by the other; the fix atomically marks the connection expired before teardown. An established SMB session and tree connection are required, and successful exploitation can corrupt kernel memory or crash the host.

CVSS severity8.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in the Linux ksmbd SMB server allows remote authenticated users to execute kernel code via concurrent tree disconnects. Concurrent SMB2_TREE_DISCONNECT handlers can obtain the same tree connection, after which one handler uses and frees state already released by the other; the fix atomically marks the connection expired before teardown. An established SMB session and tree connection are required, and successful exploitation can corrupt kernel memory or crash the host.

The record

CVE
CVE-2023-53358
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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 <30210947a343b6b3ca13adc9bfc88e1543e16dd5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39366b47a59d46af15ac57beb0996268bf911f6a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b36295c17fb97424406f0c3ab321b1ccaabb9be8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dc1c17716c099c90948ebb83e2170dd75a3be6b6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <30210947a343b6b3ca13adc9bfc88e1543e16dd5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39366b47a59d46af15ac57beb0996268bf911f6a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b36295c17fb97424406f0c3ab321b1ccaabb9be8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dc1c17716c099c90948ebb83e2170dd75a3be6b6

Published CVSS scores

7.0NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8LinuxCVSS:3.1/AV:N/AC:L/PR:L/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

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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