Out-of-bounds read in Linux kernel - CVE-2026-63897
Published: July 20, 2026
Vulnerability identifier: #VU138750
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63897
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 user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the mct_u232 USB serial driver interrupt-in transfer handler when processing short interrupt-in transfers. A local user can trigger the driver to process a specially crafted short interrupt-in packet to disclose sensitive information.
The issue can lead to stale or uninitialized slab data being exposed to user space.
How to mitigate CVE-2026-63897
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/245aba83e3c288e176ed037a1f6b618b09e92ed8
- https://git.kernel.org/stable/c/631b8b7c456567f7a8d26f6fc354c8dd9cc9f832
- https://git.kernel.org/stable/c/70bb9a2661d34b93a9b83cf83e2b76289a712ef0
- https://git.kernel.org/stable/c/82b48d70bced1ec8e5f676d1fd5eccc7a44dc418
- https://git.kernel.org/stable/c/8b93ee5baeef6efabee2c3381907733ad2dbc883
- https://git.kernel.org/stable/c/a093f3e0c03d25a86d747a655d4b9322ffb2ed87
- https://git.kernel.org/stable/c/ed260b56bc9fc878e5dcbb866eab8af0688e0e67
- https://git.kernel.org/stable/c/f06bcaba29707f060706483b2020d3cafbe98f9f