Out-of-bounds read in Linux kernel - CVE-2026-63900
Published: July 20, 2026
Vulnerability identifier: #VU138753
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63900
CWE-ID: CWE-125
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 a local attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the usa49wg indat transfer parser in drivers/usb/serial/keyspan.c when parsing malformed indat packets from a USB device. A local attacker can provide a specially crafted USB device to disclose sensitive information.
The issue can cause parsing of stale or uninitialised slab data.
How to mitigate CVE-2026-63900
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0bde5431037a076ff3750da2165fd77a6f5ff058
- https://git.kernel.org/stable/c/3759a40738b83bb61699c85f063202b514b94f77
- https://git.kernel.org/stable/c/41d9673941eebdde62ee73848fcfe4ae1105c979
- https://git.kernel.org/stable/c/ab8336a7e414f018430aa1af3a46944032f7ff96
- https://git.kernel.org/stable/c/bd6c5fe59f374b63173afe5cf0ab38a9a370f2c1
- https://git.kernel.org/stable/c/e124120e89b61a967e40dee6b5e1ecafc45c09d9
- https://git.kernel.org/stable/c/ea2b792330b44b6d7ce671c3e1d59d0c121f7ed1
- https://git.kernel.org/stable/c/f7f566ad7519c7ca3bc9071350002940a2b0e22a