Resource exhaustion in Linux kernel - CVE-2026-53321
Published: June 29, 2026
Vulnerability identifier: #VU135712
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-2026-53321
CWE-ID: CWE-400
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 improper resource management in io_uring napi busy polling when polling for events with no events found. A local user can trigger repeated busy polling to cause a denial of service.
The issue can lead to kernel complaints about a task being stuck because the polling loop lacks conditional rescheduling.
How to mitigate CVE-2026-53321
Install security update from vendor's repository.