SB2026032094 - Use After Free in Linux kernel io_uring
Published: March 20, 2026
Security Bulletin ID
SB2026032094
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-2026-23259)
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_uring/rw component when handling read/write requests. A local user can trigger improper cleanup of allocated iovec structures to cause a denial of service.
Exploitation requires access to the io_uring subsystem and the ability to submit read/write requests.
Remediation
Install update from vendor's website.