CVE-2025-40080Public exploit

Local service interruption via unsupported NBD sockets

Published Oct 28, 2025 · Updated Oct 28, 2025

Improper socket validation in the Linux kernel NBD driver allows local users to disclose limited data and interrupt service. The nbd_get_socket function accepts any socket with a shutdown operation instead of restricting input to TCP or UNIX stream sockets. Access to the local NBD setup interface is required, and crafted unsupported sockets can trigger kernel locking faults that disrupt the host.

CVSS severity6.1
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper socket validation in the Linux kernel NBD driver allows local users to disclose limited data and interrupt service. The nbd_get_socket function accepts any socket with a shutdown operation instead of restricting input to TCP or UNIX stream sockets. Access to the local NBD setup interface is required, and crafted unsupported sockets can trigger kernel locking faults that disrupt the host.

The record

CVE
CVE-2025-40080
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=083322455c67d278c56a66b73f1221f004ee600a
  2. Affected versionversion=4df728651b8a99693c69962d8e5a5b9e5a3bbcc7
  3. Affected versionversion=4fa1cbd587ef967812f9d9f6ce46ec1dead7502c
  4. Affected versionversion=5.4
  5. Affected versionversion=cf1b2326b734896734c6e167e41766f9cee7686a <37ad11f20e164c23ce827dd455b42c0fdd29685c
  6. Affected versionversion=cf1b2326b734896734c6e167e41766f9cee7686a <4f9e6ff6319dbcebea64b50af0304cf0ad7e97e7
  7. Affected versionversion=cf1b2326b734896734c6e167e41766f9cee7686a <808e2335bc1cf2293b9e36ccc94c267c81509c71
  8. Affected versionversion=cf1b2326b734896734c6e167e41766f9cee7686a <9f7c02e031570e8291a63162c6c046dc15ff85b0
  9. Affected versionversion=cf1b2326b734896734c6e167e41766f9cee7686a <c365e8f20f4201d873a70385bd919f0fb531e960

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=083322455c67d278c56a66b73f1221f004ee600a; version=4df728651b8a99693c69962d8e5a5b9e5a3bbcc7; version=4fa1cbd587ef967812f9d9f6ce46ec1dead7502c; version=5.4; version=cf1b2326b734896734c6e167e41766f9cee7686a <37ad11f20e164c23ce827dd455b42c0fdd29685c; version=cf1b2326b734896734c6e167e41766f9cee7686a <4f9e6ff6319dbcebea64b50af0304cf0ad7e97e7; version=cf1b2326b734896734c6e167e41766f9cee7686a <808e2335bc1cf2293b9e36ccc94c267c81509c71; version=cf1b2326b734896734c6e167e41766f9cee7686a <9f7c02e031570e8291a63162c6c046dc15ff85b0; version=cf1b2326b734896734c6e167e41766f9cee7686a <c365e8f20f4201d873a70385bd919f0fb531e960

Published CVSS scores

6.1OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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