CVE-2025-40269
Vulnerability Scoring
Analysis In Progress
CVE-2025-40269 Vulnerability Analysis & Exploit Details
CVE-2025-40269
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-2025-40269 Details
Status: Awaiting Analysis
Last updated: 🕕 08 Dec 2025, 18:26 UTC
Originally published on: 🕙 06 Dec 2025, 22:15 UTC
Time between publication and last update: 1 days
CVSS Release:
CVE-2025-40269 Vulnerability Summary
CVE-2025-40269: In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].
Assessing the Risk of CVE-2025-40269
Access Complexity Graph
The exploitability of CVE-2025-40269 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-2025-40269
No exploitability data is available for CVE-2025-40269.
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-2025-40269, 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-2025-40269, 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-2025-40269 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40269 does not impact data integrity.
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Availability:
None
CVE-2025-40269 does not affect system availability.
CVE-2025-40269 References
External References
- https://git.kernel.org/stable/c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf
- https://git.kernel.org/stable/c/217d47255a2ec8b246f2725f5db9ac3f1d4109d7
- https://git.kernel.org/stable/c/6a5da3fa80affc948923f20a4e086177f505e86e
- https://git.kernel.org/stable/c/98e9d5e33bda8db875cc1a4fe99c192658e45ab6
- https://git.kernel.org/stable/c/d2c04f20ccc6c0d219e6d3038bab45bc66a178ad
- https://git.kernel.org/stable/c/ece3b981bb6620e47fac826a2156c090b1a936a0
- https://git.kernel.org/stable/c/ef592bf2232a2daa9fffa8881881fc9957ea56e9
CWE Common Weakness Enumeration
Unknown
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