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

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.157/6.6.113/6.12.54/6.17.4. It has been classified as critical. This impacts the function __free of the component usb. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2025-40095. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.157/6.6.113/6.12.54/6.17.4. It has been declared as critical. Affected by this vulnerability is the function __free of the component usb. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_rndis: Refactor bind path to use __free() After an bind/unbind cycle, the rndis->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.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-40095 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 272058 (Linux Distros Unpatched Vulnerability : CVE-2025-40095), 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 ef81226bb1f8b6e761cd0b53d2696e9c1bc955d1/5f65c8ad8c7292ed7e3716343fcd590a51818cc3/380353c3a92be7d928e6f973bd065c5b79755ac3/a8366263b7e5b663d7fb489d3a9ba1e2600049a6/08228941436047bdcd35a612c1aec0912a29d8cd 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 (272058) and CERT Bund (WID-SEC-2025-2450). 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
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Dell NetWorker

Productinfo

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Version

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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: 272058
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40095

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: ef81226bb1f8b6e761cd0b53d2696e9c1bc955d1/5f65c8ad8c7292ed7e3716343fcd590a51818cc3/380353c3a92be7d928e6f973bd065c5b79755ac3/a8366263b7e5b663d7fb489d3a9ba1e2600049a6/08228941436047bdcd35a612c1aec0912a29d8cd

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-2025-40095 (🔒)
GCVE (CVE): GCVE-0-2025-40095
GCVE (VulDB): GCVE-100-330559
CERT Bund: WID-SEC-2025-2450 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/30/2025 14:16
Updated: 02/16/2026 00:06
Changes: 10/30/2025 14:16 (59), 10/30/2025 17:43 (7), 11/01/2025 13:04 (2), 12/21/2025 23:48 (1), 02/16/2026 00:06 (1)
Complete: 🔍
Cache ID: 216::103

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

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