CVE-2026-63904

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcd ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcdPatch
• https://git.kernel.org/stable/c/5de7df75ef3a2756b25fe3d582a4a2970444fe5aPatch
• https://git.kernel.org/stable/c/69020fa089f1bf0e1a10a15265f31b143a846409Patch
• https://git.kernel.org/stable/c/75f6d3da2cc646983f41807ef98851569c12bca9Patch
• https://git.kernel.org/stable/c/ae87f505917e703ae3b487d9663d78826ff43608Patch
• https://git.kernel.org/stable/c/e3eec3005de44e7f37d8d7724be636446516ab42Patch
• https://git.kernel.org/stable/c/e794bd67b3faf98af46f958897f6b91412c7d2a9Patch
• https://git.kernel.org/stable/c/f141b01eaa58ac7e323931d670318aa247bff087Patch