Executive brief
IBM Db2 Mirror for i is a database management system running on IBM i servers that organizations use for critical data storage and retrieval. A race condition vulnerability in how the software creates predictable temporary files could allow a local attacker with low-level system access to read sensitive information or disrupt service availability. While exploitation requires local access and authenticated credentials, it poses a risk for insider threats or compromised user accounts.
Technical details
This vulnerability is a time-of-check time-of-use (TOCTOU) race condition (CWE-367) involving a predictable Unix domain socket path created in a world-writable directory. A local, authenticated attacker can exploit the narrow window between the socket path's existence check and its actual creation to perform path substitution attacks. The attack vector is local with low privilege requirements and requires low attack complexity. Successful exploitation allows an attacker to read sensitive data or deny service. IBM has released PTF patches (SJ11153, SJ11193, SJ11207 for version 7.4; SJ11152, SJ11194, SJ11206 for 7.5; and SJ11151, SJ11195, SJ11205 for 7.6).
Affected products
- IBM Db2 Mirror for i 7.4, 7.5, 7.6
Timeline
- 2026-09-04: disclosed
- 2026-09-01: patched: PTF patches available for all affected versions