Out-of-bounds write in Linux kernel - CVE-2026-64366
Published: July 27, 2026
Vulnerability identifier: #VU139601
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64366
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service or execute arbitrary code.
The vulnerability exists due to an out-of-bounds write in wacom_wac_queue_insert in the Wacom HID driver when processing crafted input reports. A local user can send a specially crafted report to cause a denial of service or execute arbitrary code.
The issue is triggered when stale data in an empty kfifo is interpreted as a record length, corrupting the internal fifo state before a memcpy writes past a 256-byte buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-64366
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3