SB2026052874 - Use-after-free in Linux kernel io_uring
Published: May 28, 2026
Security Bulletin ID
SB2026052874
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) Use-after-free (CVE-ID: CVE-2026-45995)
CWE-ID: CWE-416 - Use After Free
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 use-after-free in io_free_rbuf_ring() when freeing a provided buffer ring after io_zcrx_ifq_free() has released the associated user_struct. A local user can trigger the affected io_uring zcrx cleanup path to cause a denial of service.
Remediation
Install update from vendor's website.