Resource exhaustion in Linux kernel - CVE-2026-81009
Published: September 12, 2026
Vulnerability identifier: #VU149388
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-2026-81009
CWE-ID: CWE-400
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 improper input validation in the io_uring query interface when processing a query with an oversized size value. A local user can submit a specially crafted query to cause a denial of service.
The interface is reachable through IORING_REGISTER_QUERY without creating an io_uring ring.
Affected software
Linux kernel
How to mitigate CVE-2026-81009
Install security update from vendor's repository.