CVE-2023-32252Network attack vector

System crash via concurrent SMB session requests

Published Jul 24, 2023 · Updated Aug 2, 2024

A race condition in Linux kernel ksmbd allows remote attackers to crash the system through concurrent SMB session requests. The SMB2 logoff path dereferences a session pointer without relooking up the session after a concurrent session-setup request can delete it. Authentication is not required, but ksmbd must be enabled; the confirmed consequence is a kernel crash and service interruption.

CVSS severity7.5
High
EPSS probability4.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux kernel ksmbd allows remote attackers to crash the system through concurrent SMB session requests. The SMB2 logoff path dereferences a session pointer without relooking up the session after a concurrent session-setup request can delete it. Authentication is not required, but ksmbd must be enabled; the confirmed consequence is a kernel crash and service interruption.

The record

CVE
CVE-2023-32252
Published
Jul 24, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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

7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
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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