Out-of-bounds read in Linux kernel - CVE-2026-80566
Published: August 27, 2026
Vulnerability identifier: #VU145925
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-2026-80566
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the hynitron_cstxxx touchscreen driver when parsing touch controller reports. A local user can provide crafted touch data with an invalid touch count or finger ID to cause a denial of service.
The issue can corrupt the touch state of a previously active slot, and on the V821 Avaota F1 board a finger ID of 1 is already invalid because the driver is configured with a single touch slot.
Affected software
Linux kernel
How to mitigate CVE-2026-80566
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/27f380ef0e1d3de3cde114e02d33f9320ce3a5a6
- https://git.kernel.org/stable/c/387829ee60de26c7c073ed4e27ecfab2b75d4c74
- https://git.kernel.org/stable/c/38e7d5c1ade04b99c70da0298ca296ee62bc99c0
- https://git.kernel.org/stable/c/51c5503554c87e4de4035468bebf186205391ce9
- https://git.kernel.org/stable/c/ec61ca4e310665816a639cb2e46cd9b3af0a9bee