CVE-2023-53399Network attack vector

Host crash via null IPC share path

Published Sep 18, 2025 · Updated Sep 18, 2025

NULL pointer dereference in the Linux kernel ksmbd server allows remote attackers to crash the host via an SMB2 filesystem query. The smb2_get_info_filesystem function passes the IPC$ pipe share's null path to kern_path without first rejecting a share that has no path. An unauthenticated network peer can reach the fault when ksmbd is listening and guest mapping permits an IPC$ tree connection, causing a kernel oops or panic.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

NULL pointer dereference in the Linux kernel ksmbd server allows remote attackers to crash the host via an SMB2 filesystem query. The smb2_get_info_filesystem function passes the IPC$ pipe share's null path to kern_path without first rejecting a share that has no path. An unauthenticated network peer can reach the fault when ksmbd is listening and guest mapping permits an IPC$ tree connection, causing a kernel oops or panic.

The record

CVE
CVE-2023-53399
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1636e09779f83e10e6ed57d91ef94abcefdd206b
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <227eb2689b44d0d60da3839b146983e73435924c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ac00a2ab69b34189942afa9e862d5170cdcb018
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a70751dd7b60eab025e97e19b6b2477c6eaf2bbb
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b35f6c031b87d9e51f141ff6de0ea59756a8e313

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1636e09779f83e10e6ed57d91ef94abcefdd206b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <227eb2689b44d0d60da3839b146983e73435924c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ac00a2ab69b34189942afa9e862d5170cdcb018; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a70751dd7b60eab025e97e19b6b2477c6eaf2bbb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b35f6c031b87d9e51f141ff6de0ea59756a8e313

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5LinuxCVSS: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.

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-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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo