Linux Kernel up to 6.1.155/6.6.111/6.12.52/6.17.2 nbd shutdown privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.1.155/6.6.111/6.12.52/6.17.2. This affects the function shutdown of the component nbd. Performing a manipulation results in an unknown weakness. This vulnerability is known as CVE-2025-40080. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.1.155/6.6.111/6.12.52/6.17.2. This affects the function shutdown of the component nbd. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: nbd: restrict sockets to TCP and UDP Recently, syzbot started to abuse NBD with all kinds of sockets. Commit cf1b2326b734 ("nbd: verify socket is supported during setup") made sure the socket supported a shutdown() method. Explicitely accept TCP and UNIX stream sockets.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2025-40080 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 271869 (Linux Distros Unpatched Vulnerability : CVE-2025-40080), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.156, 6.6.112, 6.12.53, 6.17.3 or 6.18-rc1 eliminates this vulnerability. Applying the patch c365e8f20f4201d873a70385bd919f0fb531e960/4f9e6ff6319dbcebea64b50af0304cf0ad7e97e7/37ad11f20e164c23ce827dd455b42c0fdd29685c/808e2335bc1cf2293b9e36ccc94c267c81509c71/9f7c02e031570e8291a63162c6c046dc15ff85b0 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (271869) and CERT Bund (WID-SEC-2025-2431). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Microsoft Azure
  • Dell NetWorker

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271869
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40080

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.156/6.6.112/6.12.53/6.17.3/6.18-rc1
Patch: c365e8f20f4201d873a70385bd919f0fb531e960/4f9e6ff6319dbcebea64b50af0304cf0ad7e97e7/37ad11f20e164c23ce827dd455b42c0fdd29685c/808e2335bc1cf2293b9e36ccc94c267c81509c71/9f7c02e031570e8291a63162c6c046dc15ff85b0

Timelineinfo

04/16/2025 CVE reserved
10/28/2025 +195 days Advisory disclosed
10/28/2025 +0 days VulDB entry created
02/15/2026 +110 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40080 (🔒)
GCVE (CVE): GCVE-0-2025-40080
GCVE (VulDB): GCVE-100-330255
CERT Bund: WID-SEC-2025-2431 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/28/2025 14:45
Updated: 02/15/2026 23:08
Changes: 10/28/2025 14:45 (58), 10/30/2025 16:37 (2), 11/25/2025 02:03 (7), 12/22/2025 02:00 (1), 02/08/2026 18:58 (1), 02/15/2026 23:08 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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