SB20260727204 - Out-of-bounds write in Linux kernel hid driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-64366)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/57bdd10ad50d68341f500a7b330f0d8949e510ec
• https://git.kernel.org/stable/c/6b3014ec0e9a390ca563030b2d7689921f0daef5
• https://git.kernel.org/stable/c/ca899a926c11a59211b764b0155d9a1cdcc32b81