CVE-2026-11885

IBM PowerVM Hypervisor in certain firmware versions allows a local attacker with administrative privileges to decrypt encrypted data because some hypervisor calls use less entropy than requested.

IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM in certain firmware versions use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC can exploit this to derive the encryption key and access data.

IBM PowerVM Hypervisor in specific versions has a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the service processor can write specially crafted configuration data, causing the host firmware boot stack to crash with possible memory corruption during system initialization.

IBM PowerVM Hypervisor in specific versions has a vulnerability in the hypervisor call interface. An attacker with root access to a guest partition can issue a specially crafted hypervisor call causing a virtual processor to become permanently unresponsive, requiring a full platform re-IPL to restore normal operation.

IBM PowerVM Hypervisor in specific versions has a vulnerability in the hypervisor call interface. An attacker with root access to a guest partition can issue a specially crafted hypervisor call to inject an arbitrary amount of data into hypervisor or partition memory, resulting in either a crash requiring a full platform re-IPL or memory corruption.

IBM PowerVM Hypervisor in specific versions has a vulnerability in partition firmware during network boot. An unauthenticated attacker with network access can prevent a partition undergoing iSCSI SAN network boot from completing its boot sequence, causing availability impact only to that partition.

IBM PowerVM Hypervisor (FW1120.00, FW1110.00-FW1110.30, FW1060.00-FW1060.80, FW950.00-FW950.H2) is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can send a specially crafted mailbox message to read or modify arbitrary regions of Hostboot memory, compromising the host firmware boot stack and the hypervisor subsequently loaded by it.

IBM PowerVM Hypervisor (FW1120.00, FW1110.00-FW1110.30, FW1060.00-FW1060.80, FW950.00-FW950.H2) is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can exploit this vulnerability, allowing arbitrary code to be executed in the host firmware runtime, giving full control over the managed system.

IBM PowerVM Hypervisor versions FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 contain a vulnerability due to improper control of format strings. A local attacker could exploit this to obtain sensitive information or cause a denial of service.

IBM PowerVM Hypervisor in specified versions allows an attacker with physical access to Transparent Memory Encryption (TME) hardware to decrypt encrypted memory due to insufficient cryptographic entropy.