CVE-2026-63904

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

State: Published
Severity: Not scored
Published: Jul 19, 2026
Updated: Jul 19, 2026
Reserved: Jul 19, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before e794bd67b3faf98af46f958897f6b91412c7d2a9Affected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before e3eec3005de44e7f37d8d7724be636446516ab42Affected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before ae87f505917e703ae3b487d9663d78826ff43608Affected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 5de7df75ef3a2756b25fe3d582a4a2970444fe5aAffected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 69020fa089f1bf0e1a10a15265f31b143a846409Affected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 75f6d3da2cc646983f41807ef98851569c12bca9Affected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before f141b01eaa58ac7e323931d670318aa247bff087Affected dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcdAffected
LinuxLinux	4.6Affected before 4.6Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.93 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.12 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before e794bd67b3faf98af46f958897f6b91412c7d2a9Affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before e3eec3005de44e7f37d8d7724be636446516ab42Affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before ae87f505917e703ae3b487d9663d78826ff43608Affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 5de7df75ef3a2756b25fe3d582a4a2970444fe5aAffected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 69020fa089f1bf0e1a10a15265f31b143a846409Affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 75f6d3da2cc646983f41807ef98851569c12bca9Affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before f141b01eaa58ac7e323931d670318aa247bff087Affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 to before 52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcdAffected

LinuxLinux

4.6Affected
before 4.6Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.93 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.12 through 7.0.*Not affected
7.1 and laterNot affected

References

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