CVE-2022-47938Network attack vector

Authenticated host crash via SMB2 error-response validation bypass

Published Dec 23, 2022 · Updated Apr 15, 2025

Out-of-bounds read in Linux kernel ksmbd 5.15 through 5.19 before 5.19.2 allows remote authenticated users to crash the host via SMB2_TREE_CONNECT. smb2_get_data_area_len treats an error response as having no data area, bypassing validation; a crafted nonzero Status with a long PathLength then makes smb_strndup_from_utf16 read past its allocated buffer. The ksmbd service must be enabled, and valid SMB credentials are required; exploitation causes a kernel OOPS and service interruption.

CVSS severity6.5
Medium
EPSS probability60.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux kernel ksmbd 5.15 through 5.19 before 5.19.2 allows remote authenticated users to crash the host via SMB2_TREE_CONNECT. smb2_get_data_area_len treats an error response as having no data area, bypassing validation; a crafted nonzero Status with a long PathLength then makes smb_strndup_from_utf16 read past its allocated buffer. The ksmbd service must be enabled, and valid SMB credentials are required; exploitation causes a kernel OOPS and service interruption.

The record

CVE
CVE-2022-47938
Published
Dec 23, 2022
Updated
Apr 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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