SB20260720301 - Out-of-bounds write in Linux kernel usb serial driver
Published: July 20, 2026
Security Bulletin ID
SB20260720301
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-63928)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows an attacker with physical access to cause memory corruption.
The vulnerability exists due to memory corruption in the omninet USB serial driver bulk-out buffer handling when processing a malicious USB device that reports a smaller endpoint max packet size than expected. An attacker with physical access can connect a crafted USB device to cause memory corruption.
The issue can lead to user-controlled slab corruption.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0bda1893e4cc4ad2b7dcdbaca246f2af688c6c2a
- https://git.kernel.org/stable/c/0fee0ccac29e088d4bfab7e2d075725dcecd803d
- https://git.kernel.org/stable/c/180996f0ca774001944e4afa452d569ba2f6455c
- https://git.kernel.org/stable/c/4e7d32189d6219beb7db37cd0ea36b6bac7dfedb
- https://git.kernel.org/stable/c/60df93d30f9bdd27db17c4d80ed80ef718d7226b
- https://git.kernel.org/stable/c/9a3860454bdfb765f936965e975c594352602ffc
- https://git.kernel.org/stable/c/b496e25ead5976bce2891dacaed09beb53a54f9f
- https://git.kernel.org/stable/c/f34cf2928387fba01a78381f3258c7e1428897d9