Linux Kernel up to 6.1.157/6.6.113/6.12.54/6.17.4 usb __free null pointer dereference

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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.1.157/6.6.113/6.12.54/6.17.4 and classified as critical. The impacted element is the function __free of the component usb. The manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2025-40093. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.157/6.6.113/6.12.54/6.17.4 and classified as critical. This issue affects the function __free of the component usb. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ecm: Refactor bind path to use __free() After an bind/unbind cycle, the ecm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request. Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2025-40093 since 04/16/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 272062 (Linux Distros Unpatched Vulnerability : CVE-2025-40093), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.158, 6.6.114, 6.12.55, 6.17.5 or 6.18-rc1 eliminates this vulnerability. Applying the patch d3745aaef19198d0c81637a7dd50ef53c4f879b7/070f341d86cf2c098d63e484a86c7c1d2696a868/15b9faf53ba8719700596e7ef78879ce200e8c2e/4630c68bade82f087eaaab22e9a361da2f18d139/42988380ac67c76bb9dff8f77d7ef3eefd50b7b5 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 (272062) and CERT Bund (WID-SEC-2025-2450). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

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

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 272062
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40093

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.158/6.6.114/6.12.55/6.17.5/6.18-rc1
Patch: d3745aaef19198d0c81637a7dd50ef53c4f879b7/070f341d86cf2c098d63e484a86c7c1d2696a868/15b9faf53ba8719700596e7ef78879ce200e8c2e/4630c68bade82f087eaaab22e9a361da2f18d139/42988380ac67c76bb9dff8f77d7ef3eefd50b7b5

Timelineinfo

04/16/2025 CVE reserved
10/30/2025 +197 days Advisory disclosed
10/30/2025 +0 days VulDB entry created
02/16/2026 +108 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40093 (🔒)
GCVE (CVE): GCVE-0-2025-40093
GCVE (VulDB): GCVE-100-330557
CERT Bund: WID-SEC-2025-2450 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/30/2025 14:10
Updated: 02/16/2026 00:06
Changes: 10/30/2025 14:10 (59), 10/30/2025 17:43 (7), 10/31/2025 08:45 (2), 12/21/2025 23:48 (1), 02/16/2026 00:06 (1)
Complete: 🔍
Cache ID: 216::103

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