CVE-2023-39180Network attack vector

Service interruption via SMB2_READ memory leak

Published Nov 18, 2024 · Updated Nov 18, 2024

Memory leak in the Linux kernel ksmbd module allows remote attackers to interrupt service via unauthenticated SMB2_READ commands. The SMB2_READ handler fails to release request-associated memory after its effective lifetime, allowing repeated reads to exhaust kernel memory. Only Linux systems with ksmbd enabled are exposed; successful exploitation depletes memory and interrupts the SMB service or host.

CVSS severity4.0
Medium
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel ksmbd module allows remote attackers to interrupt service via unauthenticated SMB2_READ commands. The SMB2_READ handler fails to release request-associated memory after its effective lifetime, allowing repeated reads to exhaust kernel memory. Only Linux systems with ksmbd enabled are exposed; successful exploitation depletes memory and interrupts the SMB service or host.

The record

CVE
CVE-2023-39180
Published
Nov 18, 2024
Updated
Nov 18, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, CWE-400, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
4.0Fedora ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-125Out-of-bounds Read
CWE-400Uncontrolled Resource Consumption
T1498Network 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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