CVE-2025-40093
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BaseFortify

Publication date: 2025-10-30

Last updated on: 2025-10-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ecm: Refactor bind path to use __free() After an bind/unbind cycle, the ecm->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.
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Meta Information
Published
2025-10-30
Last Modified
2025-10-30
Generated
2026-06-16
AI Q&A
2025-10-30
EPSS Evaluated
2026-06-14
NVD
CVE-2025-40093
Affected Vendors & Products
Currently, no data is known.
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability occurs in the Linux kernel's USB gadget function (f_ecm). After a bind/unbind cycle, a stale notify request (ecm->notify_req) remains. If a subsequent bind operation fails, the error handling code tries to free this stale request, which leads to a NULL pointer dereference when accessing the free_request operation. This can cause a kernel crash or instability. The fix involved refactoring the bind path to use an automatic cleanup mechanism (__free()) to properly handle this scenario.

Impact Analysis

This vulnerability can cause a NULL pointer dereference in the Linux kernel, potentially leading to a kernel crash or system instability. This could result in denial of service or unexpected behavior on systems using the affected USB gadget functionality.

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