SB20260720339 - Improper input validation in Linux kernel usb serial driver
Published: July 20, 2026
Security Bulletin ID
SB20260720339
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-63901)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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 improper input validation in the digi_acceleport USB serial driver when handling a malicious USB device that reports smaller bulk-out buffers than expected. An attacker with physical access can connect a crafted device to cause memory corruption.
The issue can lead to out-of-bounds memory accesses or slab corruption.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/062dcc0b324afd03b1406f157190804f105718bb
- https://git.kernel.org/stable/c/25b93d0f229a115ab120106f37b9454170d4cfd4
- https://git.kernel.org/stable/c/41b645e791099f0038225da5e2ca3ca31f00d435
- https://git.kernel.org/stable/c/6ab1e9ae099577a1019312088309ecbad2da9a91
- https://git.kernel.org/stable/c/8a65db5edd7b63365e9c5b7d9f4b8f314696dc49
- https://git.kernel.org/stable/c/9469419b12a100e7e2ccdda64ab45b8368456c8a
- https://git.kernel.org/stable/c/cb3560e8eab1dfa1cac1ed52631adf8ec6ff2cd5
- https://git.kernel.org/stable/c/fd34198c2e5d164b57a7dcd4692626fece319225