Linux Kernel up to 6.1.158/6.6.118/6.12.60/6.17.10 gs_usb_receive_bulk_callback 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 labeled as critical has been found in Linux Kernel up to 6.1.158/6.6.118/6.12.60/6.17.10. Affected by this issue is the function gs_usb_receive_bulk_callback. Such manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2025-68343. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.1.158/6.6.118/6.12.60/6.17.10. Affected by this issue is the function gs_usb_receive_bulk_callback. 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. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing header The driver expects to receive a struct gs_host_frame in gs_usb_receive_bulk_callback(). Use struct_group to describe the header of the struct gs_host_frame and check that we have at least received the header before accessing any members of it. To resubmit the URB, do not dereference the pointer chain "dev->parent->hf_size_rx" but use "parent->hf_size_rx" instead. Since "urb->context" contains "parent", it is always defined, while "dev" is not defined if the URB it too short.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-68343 since 12/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 279641 (Linux Distros Unpatched Vulnerability : CVE-2025-68343), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.159, 6.6.119, 6.12.61 or 6.17.11 eliminates this vulnerability. Applying the patch 18cbce43363c9f84b90a92d57df341155eee0697/3433680b759646efcacc64fe36aa2e51ae34b8f0/616eee3e895b8ca0028163fcb1dce5e3e9dea322/f31693dc3a584c0ad3937e857b59dbc1a7ed2b87/6fe9f3279f7d2518439a7962c5870c6e9ecbadcf 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 (279641), EUVD (EUVD-2025-204798) and CERT Bund (WID-SEC-2025-2915). Once again VulDB remains the best source for 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: 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: 279641
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-68343

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.159/6.6.119/6.12.61/6.17.11
Patch: 18cbce43363c9f84b90a92d57df341155eee0697/3433680b759646efcacc64fe36aa2e51ae34b8f0/616eee3e895b8ca0028163fcb1dce5e3e9dea322/f31693dc3a584c0ad3937e857b59dbc1a7ed2b87/6fe9f3279f7d2518439a7962c5870c6e9ecbadcf

Timelineinfo

12/16/2025 CVE reserved
12/23/2025 +7 days Advisory disclosed
12/23/2025 +0 days VulDB entry created
01/04/2026 +12 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-68343 (🔒)
GCVE (CVE): GCVE-0-2025-68343
GCVE (VulDB): GCVE-100-337844
EUVD: 🔒
CERT Bund: WID-SEC-2025-2915 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/23/2025 15:15
Updated: 01/04/2026 18:49
Changes: 12/23/2025 15:15 (58), 12/23/2025 22:11 (1), 12/24/2025 01:41 (2), 01/04/2026 18:49 (7)
Complete: 🔍
Cache ID: 216::103

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