CVE-2026-89734

Received Received - Intake

Null Pointer Dereference in Linux Kernel USB Gadget UVC Driver

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: Fix null pointer dereference in uvcg_video_init() In uvcg_video_init(), if kthread_run_worker() fails, the error logged uses uvcg_err(), however, the pointer it uses: video->uvc is not assigned at this point, triggering a null pointer dereference. Fix this by directly using uvc->func which is assigned already.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-11

Last Modified

2026-09-11

Generated

2026-10-02

AI Q&A

2026-09-12

EPSS Evaluated

2026-10-01

NVD

CVE-2026-89734

EUVD

EUVD-2026-76646

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is a null pointer dereference issue in the Linux kernel's USB gadget UVC (USB Video Class) driver. It occurs in the uvcg_video_init() function when kthread_run_worker() fails. The error handling code attempts to log an error using uvcg_err() with an uninitialized pointer video->uvc, which causes a crash due to the null pointer dereference.

Detection Guidance

This vulnerability is specific to the Linux kernel's USB gadget UVC (USB Video Class) functionality. Detection requires checking kernel logs for null pointer dereference errors related to uvcg_video_init() or uvcg_err(). Use commands like dmesg | grep -i 'uvcg_video_init\|null pointer' or journalctl -k | grep -i 'uvcg_video_init\|null pointer' to search for relevant errors.

Impact Analysis

If exploited, this vulnerability could cause a system crash or kernel panic, leading to denial of service. It may also allow local attackers to trigger unexpected behavior in the USB gadget subsystem, potentially affecting connected devices or system stability.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or other common standards and regulations. It is a null pointer dereference issue in the Linux kernel's USB gadget UVC driver, which could lead to system instability or crashes but does not involve data exposure or privacy violations typical of compliance concerns.

Mitigation Strategies

Apply the latest Linux kernel update that includes the fix for this vulnerability. Monitor kernel logs for any signs of exploitation or errors related to USB gadget UVC functionality. If immediate patching is not possible, consider disabling the USB gadget UVC module if it is not required.

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