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    CVE-2026-17042

    IBM Power Systems Firmware FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 - OP940.81 (Power HMC) is affected by a vulnerability in host firmware NVRAM parsing. An attacker with root access to a guest partition on an OpenPOWER system can write a specially crafted NVRAM image, causing the host firmware boot stage to crash with possible memory corruption. This condition persists until operator intervention — clearing NVRAM via the service processor — to restore normal operation. This vulnerability only affects OpenPOWER systems; systems running PowerVM are not affected. Successful exploitation results in an integrity and availability impact to the managed system.

    Published:Aug 19, 2026
    Last Modified:Aug 25, 2026
    EPS:Aug 19, 2026
    EPSS Score:0.00105
    CVSS Score:7.3

    Affected Products

    Vendor
    Ibm
    Product
    Power Hardware Management Console \(7063-cr2\)
    Vendor
    Ibm
    Product
    Power Hardware Management Console \(7063-cr2\) Firmware
    Vendor
    Ibm
    Product
    Power System Ac922 \(8335-gth\)
    Vendor
    Ibm
    Product
    Power System Ac922 \(8335-gth\) Firmware
    Vendor
    Ibm
    Product
    Power System Ac922 \(8335-gtx\)
    Vendor
    Ibm
    Product
    Power System Ac922 \(8335-gtx\) Firmware
    Vendor
    Ibm
    Product
    Power System E950 \(9040-mr9\)
    Vendor
    Ibm
    Product
    Power System E950 \(9040-mr9\) Firmware
    Vendor
    Ibm
    Product
    Power System E980 \(9080-m9s\)
    Vendor
    Ibm
    Product
    Power System E980 \(9080-m9s\) Firmware
    Vendor
    Ibm
    Product
    Power System H922 \(9223-22s\)
    Vendor
    Ibm
    Product
    Power System H922 \(9223-22s\) Firmware
    Vendor
    Ibm
    Product
    Power System H924 \(9223-42s\)
    Vendor
    Ibm
    Product
    Power System H924 \(9223-42s\) Firmware
    Vendor
    Ibm
    Product
    Power System S914 \(9009-41g\)
    Vendor
    Ibm
    Product
    Power System S914 \(9009-41g\) Firmware
    Vendor
    Ibm
    Product
    Power System S922 \(9009-22g\)
    Vendor
    Ibm
    Product
    Power System S922 \(9009-22g\) Firmware
    Vendor
    Ibm
    Product
    Power System S924 \(9009-42g\)
    Vendor
    Ibm
    Product
    Power System S924 \(9009-42g\) Firmware
    Vendor
    Ibm
    Product
    Power Systems Firmware

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High