CVE-2026-63904: usb: usbtmc: check URB actual_length for interrupt-IN notifications
Vulnerability summary
CVE-2026-63904 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 32 · Related 32Timeline
- 19-07-2026PublishedVulnerability first disclosed.
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.
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.23%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.23% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu166 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
Linux1 product
- linux≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < e794bd67b3faf98af46f958897f6b91412c7d2a9 | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < e3eec3005de44e7f37d8d7724be636446516ab42 | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < ae87f505917e703ae3b487d9663d78826ff43608 | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < 5de7df75ef3a2756b25fe3d582a4a2970444fe5a | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < 69020fa089f1bf0e1a10a15265f31b143a846409 | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < 75f6d3da2cc646983f41807ef98851569c12bca9 | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < f141b01eaa58ac7e323931d670318aa247bff087 | ≥ dbf3e7f654c0f06a932b8fcafac78de9d0b81d68, < 52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcd | 4.6
3 vendors · 168 products
