CVE-2026-63903: Linux kernel · USB: serial: belkin_sa: validate interrupt status length
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 15:36 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
The vulnerability has been resolved in the Linux kernel by adding checks to validate the interrupt packet length before parsing status fields in the belkin_sa driver. Users should update their Linux kernel to a version that includes this fix once it is available.
Description
A vulnerability in the Linux kernel's USB serial driver for Belkin devices allows out-of-bounds or stale status-byte reads due to improper validation of interrupt status length. The driver assumes a fixed four-byte interrupt status report, but shorter interrupt packets can occur and were not properly checked, leading to potential memory safety issues.
References
- git.kernel.org/stable/c/f1617539ab90e67da788959bfd314076f093a11a (opens in a new tab)
- git.kernel.org/stable/c/f361359a952da15e70e693c2d7dca5c5843eae3e (opens in a new tab)
- git.kernel.org/stable/c/37e54d1b986df35c936d81e5b59a7aa3ec6938f0 (opens in a new tab)
- git.kernel.org/stable/c/ffb739a49186ea784bbd9cb91b647f062395b419 (opens in a new tab)
- git.kernel.org/stable/c/6a4602221cba7a738442328d66a2f0b1c9bf6e17 (opens in a new tab)
- git.kernel.org/stable/c/22823a319fb2afdf02cacafbed8b613b757efbc8 (opens in a new tab)
- git.kernel.org/stable/c/db1e7eb6203d534dad64cac2c793b69e561e657b (opens in a new tab)
- git.kernel.org/stable/c/4ce058df2ee02cc2a0f0fd5cd64ce6f1482a0b65 (opens in a new tab)