CVE-2023-32254Network attack vector

Kernel code execution via concurrent tree disconnects

Published Jul 10, 2023 · Updated Feb 13, 2025

Use-after-free in Linux kernel ksmbd allows remote attackers to execute kernel code through concurrent SMB2_TREE_DISCONNECT requests. The handler does not atomically mark a tree connection expired before concurrent disconnect paths reuse and free the same object. The ksmbd server must be enabled and reachable over SMB; successful exploitation causes a kernel crash or code execution in kernel context.

CVSS severity8.1
High
EPSS probability2.91%
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 kernel ksmbd allows remote attackers to execute kernel code through concurrent SMB2_TREE_DISCONNECT requests. The handler does not atomically mark a tree connection expired before concurrent disconnect paths reuse and free the same object. The ksmbd server must be enabled and reachable over SMB; successful exploitation causes a kernel crash or code execution in kernel context.

The record

CVE
CVE-2023-32254
Published
Jul 10, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Red HatCVSS:3.1/AV:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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