CVE-2026-63904

usb: usbtmc: check URB actual_length for interrupt-IN notifications

published July 19, 2026

CVSS
—
EPSS
0%
Percentile
12.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00226 · 12.5th percentile
Published
2026-07-19T14:55Z
EPSS history
Timeline
  • 19 JUL 14:55Z
    usb: usbtmc: check URB actual_length for interrupt-IN notifications
    cvelistv5