Out-of-bounds read in Linux kernel - CVE-2026-31771
Published: May 2, 2026
Vulnerability identifier: #VU128921
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31771
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 attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the Bluetooth HCI event handling logic when processing a short HCI event frame. A local attacker can send a specially crafted HCI event frame to cause a denial of service.
The issue occurs because wake reason storage is reached before per-event minimum payload length validation is enforced.
How to mitigate CVE-2026-31771
Install security update from vendor's repository.