Linux Kernel up to 6.17.8 Bluetooth btusb_disconnect use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.17.8 and classified as critical. Affected by this issue is the function btusb_disconnect of the component Bluetooth. The manipulation results in use after free. This vulnerability is reported as CVE-2025-40283. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.17.8. Affected is the function btusb_disconnect of the component Bluetooth. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: reorder cleanup in btusb_disconnect to avoid UAF There is a KASAN: slab-use-after-free read in btusb_disconnect(). Calling "usb_driver_release_interface(&btusb_driver, data->intf)" will free the btusb data associated with the interface. The same data is then used later in the function, hence the UAF. Fix by moving the accesses to btusb data to before the data is free'd.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2025-40283 since 04/16/2025. The exploitability is told to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/23/2026).

The vulnerability scanner Nessus provides a plugin with the ID 278559 (Debian dla-4404 : ata-modules-5.10.0-35-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59 or 6.17.9 eliminates this vulnerability. Applying the patch 297dbf87989e09af98f81f2bcb938041785557e8/f858f004bc343a7ae9f2533bbb2a3ab27428532f/7a6d1e740220ff9dfcb6a8c994d6ba49e76db198/5dc00065a0496c36694afe11e52a5bc64524a9b8/1c28c1e1522c773a94e26950ffb145e88cd9834b/95b9b98c93b1c0916a3d4cf4540b7f5d69145a0d/a2610ecd9fd5708be8997ca8f033e4200c0bb6af/23d22f2f71768034d6ef86168213843fc49bf550 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 (278559), EUVD (EUVD-2025-201572) and CERT Bund (WID-SEC-2025-2756). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

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

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 278559
Nessus Name: Debian dla-4404 : ata-modules-5.10.0-35-armmp-di - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.302/5.10.247/5.15.197/6.1.159/6.6.117/6.12.59/6.17.9
Patch: 297dbf87989e09af98f81f2bcb938041785557e8/f858f004bc343a7ae9f2533bbb2a3ab27428532f/7a6d1e740220ff9dfcb6a8c994d6ba49e76db198/5dc00065a0496c36694afe11e52a5bc64524a9b8/1c28c1e1522c773a94e26950ffb145e88cd9834b/95b9b98c93b1c0916a3d4cf4540b7f5d69145a0d/a2610ecd9fd5708be8997ca8f033e4200c0bb6af/23d22f2f71768034d6ef86168213843fc49bf550

Timelineinfo

04/16/2025 CVE reserved
12/07/2025 +235 days Advisory disclosed
12/07/2025 +0 days VulDB entry created
02/23/2026 +78 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40283 (🔒)
GCVE (CVE): GCVE-0-2025-40283
GCVE (VulDB): GCVE-100-334632
EUVD: 🔒
CERT Bund: WID-SEC-2025-2756 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/07/2025 08:54
Updated: 02/23/2026 06:41
Changes: 12/07/2025 08:54 (59), 12/07/2025 09:27 (1), 12/09/2025 08:12 (7), 12/13/2025 16:41 (2), 01/04/2026 13:21 (1), 01/22/2026 09:03 (1), 02/23/2026 06:41 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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