Linux Kernel up to 6.17.8 isdn hfcsusb_probe memory leak

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

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.17.8. This affects the function hfcsusb_probe of the component isdn. The manipulation leads to memory leak. This vulnerability is referenced as CVE-2025-68734. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.17.8 and classified as critical. This issue affects the function hfcsusb_probe of the component isdn. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: isdn: mISDN: hfcsusb: fix memory leak in hfcsusb_probe() In hfcsusb_probe(), the memory allocated for ctrl_urb gets leaked when setup_instance() fails with an error code. Fix that by freeing the urb before freeing the hw structure. Also change the error paths to use the goto ladder style. Compile tested only. Issue found using a prototype static analysis tool.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2025-68734 since 12/24/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 279732 (Linux Distros Unpatched Vulnerability : CVE-2025-68734), 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 475032fa2bb82ffb592c321885e917e39f47357f/adb7577e23a431fc53aa1b6107733c0d751015fb/b70c24827e11fdc71465f9207e974526fb457bb9/3f7c72bc73c4e542fde14cce017549d8a0b61a3c/03695541b3349bc40bf5d6563d44d6147fb20260/6dce43433e0635e7b00346bc937b69ce48ea71bb/ea7936304ed74ab7f965d17f942a173ce91a5ca8/3f978e3f1570155a1327ffa25f60968bc7b9398f 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 (279732) and CERT Bund (WID-SEC-2025-2920). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source Linux Kernel

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: Memory leak
CWE: CWE-401 / 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: 279732
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-68734

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: 475032fa2bb82ffb592c321885e917e39f47357f/adb7577e23a431fc53aa1b6107733c0d751015fb/b70c24827e11fdc71465f9207e974526fb457bb9/3f7c72bc73c4e542fde14cce017549d8a0b61a3c/03695541b3349bc40bf5d6563d44d6147fb20260/6dce43433e0635e7b00346bc937b69ce48ea71bb/ea7936304ed74ab7f965d17f942a173ce91a5ca8/3f978e3f1570155a1327ffa25f60968bc7b9398f

Timelineinfo

12/24/2025 Advisory disclosed
12/24/2025 +0 days CVE reserved
12/24/2025 +0 days VulDB entry created
12/29/2025 +5 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-68734 (🔒)
GCVE (CVE): GCVE-0-2025-68734
GCVE (VulDB): GCVE-100-338225
CERT Bund: WID-SEC-2025-2920 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 12/24/2025 15:31
Updated: 12/29/2025 10:56
Changes: 12/24/2025 15:31 (59), 12/25/2025 23:33 (7), 12/29/2025 10:56 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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