CVE-2023-32248Network attack vector

Remote system crash via unchecked share path

Published Jul 24, 2023 · Updated Aug 2, 2024

NULL pointer dereference in Linux kernel 5.15 through 6.3.9 allows remote attackers to crash systems through crafted SMB requests. In smb2_get_info_filesystem(), ksmbd passes share->path to kern_path() without first rejecting a null share path. Exploitation requires ksmbd to be enabled, a non-default state on Ubuntu, and interrupts the host by triggering a kernel crash.

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

NULL pointer dereference in Linux kernel 5.15 through 6.3.9 allows remote attackers to crash systems through crafted SMB requests. In smb2_get_info_filesystem(), ksmbd passes share->path to kern_path() without first rejecting a null share path. Exploitation requires ksmbd to be enabled, a non-default state on Ubuntu, and interrupts the host by triggering a kernel crash.

The record

CVE
CVE-2023-32248
Published
Jul 24, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
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

7.5Ubuntu Security TeamCVSS: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
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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