Heap-based buffer overflow in Linux kernel - CVE-2026-89620
Published: September 12, 2026
Vulnerability identifier: #VU149182
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89620
CWE-ID: CWE-122
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 a heap-based buffer overflow in write_cmd_to_txdma() of the intel-quickspi HID driver when handling an oversized hidraw SET_REPORT or SET_FEATURE ioctl. A local user can submit an oversized report to overflow the report buffer and cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89620
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3