CVE-2026-63904

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.

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