Potential Impact on Processors in the POWER Family

Share this post:

In January 2018, three security vulnerabilities were made public that allow unauthorized users to bypass the hardware barrier between applications and kernel memory. These vulnerabilities all make use of speculative execution to perform side-channel information disclosure attacks. The first two vulnerabilities, CVE-2017-5753 and CVE-2017- 5715, are collectively known as Spectre, and allow user-level code to infer data from unauthorized memory; the third vulnerability, CVE-2017-5754, is known as Meltdown, and allows user-level code to infer the contents of kernel memory.

In May 2018, a fourth variant was identified, CVE-2018-3639. This variant is another instantiation of a side-channel information disclosure attack. All of these identified vulnerabilities are variants of the same class of attacks but differ in the way that speculative execution is exploited.

These vulnerabilities do not allow an external unauthorized party to gain access to a machine, but they could allow a party that has access to the system to access unauthorized data.

If these vulnerabilities pose a risk to your environment, then the first line of defense is the firewalls and security tools that most organizations already have in place.

On August 15, 2018, security vulnerabilities codenamed Foreshadow/L1TF (CVE-2018-3620, CVE-2018-3646 and CVE-2018-3615) were announced. Two of the vulnerabilities (CVE-2018-3620 and CVE-2018-3646) could potentially impact Power Systems. The Firmware and OS patches released by IBM in February and March 2018 to address the original Meltdown vulnerability (CVE-2017-5754) also address the L1TF/Foreshadow vulnerability, except for Power 9 Systems running with KVM Hypervisor. OS patch for Power 9 KVM Systems will be made available soon. The Firmware and OS patches for all other Power Systems are available in this blog below.

The third L1TF/Foreshadow vulnerability (CVE-2018-3615) relates to SGX implementation and does not impact the Power Systems.

In May 2019, new side channel attack variants code named Microarchitectural Data Sampling (MDS) (CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, and CVE-2019-11091) were disclosed. These vulnerabilities do not impact Power Systems.

Mitigation for the vulnerabilities that impact Power Systems involves installing patches to both system firmware and operating systems. Both the firmware and OS patches are required for the mitigation to be effective against these vulnerabilities and the latest firmware and OS patches incorporate mitigations for the fourth variant. These will be available as follows:

  • Firmware patches for POWER7, POWER7+, POWER8 and POWER9 platforms are now available via FixCentral.

    • Linux operating systems patches are now available through our Linux distribution partners Red Hat, SUSE and Canonical.
    • IBM i operating system patches are now available via FixCentral.
    • AIX patches are now available via AIX Security .
  • Consistent with previously announced end of service, IBM will not be releasing patches for POWER4, POWER5, POWER6 systems and recommends migrating to a more current generation of POWER technology. We are committed to helping our clients address these vulnerabilities and have introduced an offer for pre-POWER7 clients to upgrade their security profile and protect against Spectre and Meltdown through the purchase of POWER8 or POWER9 systems and available migration services, security support, and financing offers.
  • Information about generations prior to POWER4 will be communicated on an as-needed basis.

We will continue to provide information about these patches via PSIRT and security bulletins.

Clients should review these patches in the context of their datacenter environment and standard evaluation practices to determine if they should be applied.

More stories

IBM Product Security Incident Response


October 17, 2022

IBM acknowledges and thanks the security researchers and organizations listed below for reporting and working with us to resolve one or more security vulnerabilities in our products and services. Disclosures for 2022 Credit to Jagadeesh Vasireddy (email, LinkedIn) Mikhail Zakharov (email, LinkedIn) Akshay Shelke (LinkedIn, Secureise, Twitter) Love Yadav (email, LinkedIn) Digant Prajapati (email, LinkedIn) ...read more

A new and advanced Rowhammer-based attack on DDR4 memory

March 11, 2020

A new and advanced Rowhammer-based attack on DDR4 memory was announced on March 10, 2020. (CVE-2020-10255) The attack has been shown to cause memory corruption in lab environments. Vulnerability exploitation on IBM Power processor architectures, IBM Z-based architectures, IBM Cloud and IBM storage products would be difficult. No customer actions are currently required. IBM Power ...read more

XSA-353 Security Vulnerabilities

November 13, 2019

Security vulnerability CVE-2020-29479 could potentially enable a denial of service attack or allow unauthorized access to the hypervisor, and is addressed by Citrix in XSA-353 security advisories. IBM Cloud has worked with its technology partners to deploy mitigation and remediation measures. There is no known malicious exploit of this vulnerability at this time. ...read more