Stack-based buffer overflow in Linux kernel - CVE-2026-31772
Published: May 2, 2026
Vulnerability identifier: #VU128922
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-2026-31772
CWE-ID: CWE-121
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 user to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in hci_le_big_create_sync when processing a crafted ISO socket configuration. A local user can bind an ISO socket with a large number of BIS entries and call listen() to cause a denial of service.
The issue is triggered when the number of BIS entries is between 18 and 31, leading to a stack out-of-bounds write in the HCI command sync worker.
How to mitigate CVE-2026-31772
Install security update from vendor's repository.