CVE-2026-63904 Details
Description
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.
A vulnerability has been identified in the Linux kernel USB Test and Measurement Class (USBTMC) driver, specifically in how it handles interrupt notifications from USBTMC devices. The driver fails to verify the presence of required two-byte header information before accessing data buffers. This oversight can lead to two potential issues: an out-of-bounds read, where the driver reads beyond the allocated buffer space, or the consumption of outdated data from a previous notification. The vulnerability arises when the actual length of the received data (URB actual_length) is insufficient to accommodate the headers, allowing for improper data handling and potential exploitation.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for downloading the patched kernel can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 19, 2026 | New CVE Received | kernel.org |