CVE-2026-11885 is a buffer overflow vulnerability in IBM PowerVM Hypervisor that occurs due to improper input size validation during a hypervisor call. This flaw can lead to a crash of the hypervisor or compromise the integrity of the operating system memory. The affected versions include FW1110.00 to FW1110.20, FW1060.00 to FW1060.71, and FW950.00 to FW950.H1. The vulnerability allows an attacker with limited privileges to cause denial of service or potentially escalate privileges by corrupting memory. The CVSS 3.1 vector indicates local attack vector, low attack complexity, required privileges, no user interaction, and scope change with high impact on integrity and availability. There is no vendor advisory or patch information currently available, and no known exploitation in the wild has been reported.

Successful exploitation can cause the IBM PowerVM Hypervisor to crash, resulting in denial of service, or compromise the integrity of OS memory, potentially leading to privilege escalation or other unauthorized actions. The vulnerability affects system stability and security by allowing memory corruption through a crafted hypervisor call.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, limit access to systems running affected versions to trusted users only and monitor for unusual hypervisor activity. Avoid executing untrusted code or hypervisor calls from less privileged users.