CVE-2026-63904
Vulnerability Scoring
Analysis In Progress
CVE-2026-63904 Vulnerability Analysis & Exploit Details
CVE-2026-63904
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-2026-63904 Details
Status: Received on 19 Jul 2026, 16:17 UTC
Published on: 19 Jul 2026, 16:17 UTC
CVSS Release:
CVE-2026-63904 Vulnerability Summary
CVE-2026-63904: In the Linux kernel, the following vulnerability has been resolved: usb: usbtmc: check URB actual_length for interrupt-IN notifications USBTMC devices can use an optional interrupt endpoint for notification messages. These typically contain two-byte headers indicating the payload format, but the driver does not check if these headers are present before accessing the data buffers. In cases where the URB actual_length is not enough to fit these headers, the driver will either cause an out-of-bounds read, or consume stale leftover data from a previous notification. Fix by checking if actual_data contains enough bytes for the headers, otherwise resubmit URB to the interrupt endpoint.
Assessing the Risk of CVE-2026-63904
Access Complexity Graph
The exploitability of CVE-2026-63904 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-2026-63904
No exploitability data is available for CVE-2026-63904.
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-2026-63904, 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-2026-63904, 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-2026-63904 does not compromise confidentiality.
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Integrity:
None
CVE-2026-63904 does not impact data integrity.
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Availability:
None
CVE-2026-63904 does not affect system availability.
CVE-2026-63904 References
External References
- https://git.kernel.org/stable/c/52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcd
- https://git.kernel.org/stable/c/5de7df75ef3a2756b25fe3d582a4a2970444fe5a
- https://git.kernel.org/stable/c/69020fa089f1bf0e1a10a15265f31b143a846409
- https://git.kernel.org/stable/c/75f6d3da2cc646983f41807ef98851569c12bca9
- https://git.kernel.org/stable/c/ae87f505917e703ae3b487d9663d78826ff43608
- https://git.kernel.org/stable/c/e3eec3005de44e7f37d8d7724be636446516ab42
- https://git.kernel.org/stable/c/e794bd67b3faf98af46f958897f6b91412c7d2a9
- https://git.kernel.org/stable/c/f141b01eaa58ac7e323931d670318aa247bff087
CWE Common Weakness Enumeration
Unknown
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