Linux Kernel up to 5.15.196/6.1.158/6.6.116/6.12.57/6.17.7 Configfs Interface nvmet_port_subsys_drop_link privilege escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 5.15.196/6.1.158/6.6.116/6.12.57/6.17.7 and classified as critical. This affects the function nvmet_port_subsys_drop_link of the component Configfs Interface. This manipulation causes an unknown weakness. This vulnerability is tracked as CVE-2025-40343. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.196/6.1.158/6.6.116/6.12.57/6.17.7. It has been declared as critical. Affected by this vulnerability is the function nvmet_port_subsys_drop_link of the component Configfs Interface. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: nvmet-fc: avoid scheduling association deletion twice When forcefully shutting down a port via the configfs interface, nvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and then nvmet_disable_port(). Both functions will eventually schedule all remaining associations for deletion. The current implementation checks whether an association is about to be removed, but only after the work item has already been scheduled. As a result, it is possible for the first scheduled work item to free all resources, and then for the same work item to be scheduled again for deletion. Because the association list is an RCU list, it is not possible to take a lock and remove the list entry directly, so it cannot be looked up again. Instead, a flag (terminating) must be used to determine whether the association is already in the process of being deleted.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2025-40343 since 04/16/2025. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/20/2025).

The vulnerability scanner Nessus provides a plugin with the ID 277836 (Linux Distros Unpatched Vulnerability : CVE-2025-40343), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.197, 6.1.159, 6.6.117, 6.12.58 or 6.17.8 eliminates this vulnerability. Applying the patch 2f4852db87e25d4e226b25cb6f652fef9504360e/85e2ce1920cb511d57aae59f0df6ff85b28bf04d/601ed47b2363c24d948d7bac0c23abc8bd459570/04d17540ef51e2c291eb863ca87fd332259b2d40/c09ac9a63fc3aaf4670ad7b5e4f5afd764424154/f2537be4f8421f6495edfa0bc284d722f253841d 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 (277836) and EUVD (EUVD-2025-201859). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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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

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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: 277836
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40343

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.197/6.1.159/6.6.117/6.12.58/6.17.8
Patch: 2f4852db87e25d4e226b25cb6f652fef9504360e/85e2ce1920cb511d57aae59f0df6ff85b28bf04d/601ed47b2363c24d948d7bac0c23abc8bd459570/04d17540ef51e2c291eb863ca87fd332259b2d40/c09ac9a63fc3aaf4670ad7b5e4f5afd764424154/f2537be4f8421f6495edfa0bc284d722f253841d

Timelineinfo

04/16/2025 CVE reserved
12/09/2025 +237 days Advisory disclosed
12/09/2025 +0 days VulDB entry created
12/20/2025 +11 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40343 (🔒)
GCVE (CVE): GCVE-0-2025-40343
GCVE (VulDB): GCVE-100-334897
EUVD: 🔒

Entryinfo

Created: 12/09/2025 07:41
Updated: 12/20/2025 20:21
Changes: 12/09/2025 07:41 (58), 12/09/2025 21:27 (2), 12/20/2025 20:21 (1)
Complete: 🔍
Cache ID: 216:C8F:103

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