SB2025090896 - Privilege escalation in Linux kernel io_uring
Published: September 8, 2025 Updated: September 25, 2025
Security Bulletin ID
SB2025090896
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 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-39698)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the io_futex_wait() function in io_uring/futex.c. A local user can execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.