SB2026062923 - Resource exhaustion in Linux kernel io_uring
Published: June 29, 2026
Security Bulletin ID
SB2026062923
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2026-53321)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 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
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.
Remediation
Install update from vendor's website.