CVE-2025-40223
Vulnerability Scoring
Analysis In Progress
CVE-2025-40223 Vulnerability Analysis & Exploit Details
CVE-2025-40223
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2025-40223 Details
Status: Awaiting Analysis
Published on: 04 Dec 2025, 16:16 UTC
CVSS Release:
CVE-2025-40223 Vulnerability Summary
CVE-2025-40223: In the Linux kernel, the following vulnerability has been resolved: most: usb: Fix use-after-free in hdm_disconnect hdm_disconnect() calls most_deregister_interface(), which eventually unregisters the MOST interface device with device_unregister(iface->dev). If that drops the last reference, the device core may call release_mdev() immediately while hdm_disconnect() is still executing. The old code also freed several mdev-owned allocations in hdm_disconnect() and then performed additional put_device() calls. Depending on refcount order, this could lead to use-after-free or double-free when release_mdev() ran (or when unregister paths also performed puts). Fix by moving the frees of mdev-owned allocations into release_mdev(), so they happen exactly once when the device is truly released, and by dropping the extra put_device() calls in hdm_disconnect() that are redundant after device_unregister() and most_deregister_interface(). This addresses the KASAN slab-use-after-free reported by syzbot in hdm_disconnect(). See report and stack traces in the bug link below.
Assessing the Risk of CVE-2025-40223
Access Complexity Graph
The exploitability of CVE-2025-40223 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2025-40223
No exploitability data is available for CVE-2025-40223.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2025-40223, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2025-40223, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2025-40223 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40223 does not impact data integrity.
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Availability:
None
CVE-2025-40223 does not affect system availability.
CVE-2025-40223 References
External References
- https://git.kernel.org/stable/c/33daf469f5294b9d07c4fc98216cace9f4f34cc6
- https://git.kernel.org/stable/c/3a3b8e89c7201c5b3b76ac4a4069d1adde1477d6
- https://git.kernel.org/stable/c/4b1270902609ef0d935ed2faa2ea6d122bd148f5
- https://git.kernel.org/stable/c/578eb18cd111addec94c43f61cd4b4429e454809
- https://git.kernel.org/stable/c/5b5c478f09b1b35e7fe6fc9a1786c9bf6030e831
- https://git.kernel.org/stable/c/72427dc6f87523995f4e6ae35a948bb2992cabce
- https://git.kernel.org/stable/c/f93a84ffb884d761a9d4e869ba29c238711e81f1
CWE Common Weakness Enumeration
Unknown
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