Improper input validation in Linux kernel - CVE-2026-63901
Published: July 20, 2026
Vulnerability identifier: #VU138754
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-63901
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-63901
Install security update from vendor's repository.
Sources
- 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