TI-2026-71331 Aliases CVE-2026-96266 GHSA-cxch-p56r-27hr

Stack-based buffer overflow in IBM Power Systems Firmware

LOW 36CWE-121Published 2026-10-12 · Updated 2026-10-13

Key facts

Attack vector: Local
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

IBM Power Systems Firmware FW1060.00 through FW1060.81 contains a stack-based buffer overflow (CWE-121) in host firmware configuration parsing. An attacker with authenticated service-level access to the FSP can write specially crafted configuration data that corrupts memory during system boot. Successful exploitation can compromise the host firmware boot stack and the hypervisor loaded by it, affecting the confidentiality, integrity and availability of the managed system.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the FSP can write specially crafted configuration data to cause memory corruption in the host firmware boot stage during system IPL, compromising the host firmware boot stack and the hypervisor subsequently loaded by it. Successful exploitation results in a confidentiality, integrity, and availability impact to the managed system.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00123 2nd percentileScored 2026-11-08

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
IBM	PowerVM Hypervisor	FW1060.00 – FW1060.81	—	No fix listed	CNA

PowerVM Hypervisor VendorIBM Affected FW1060.00 – FW1060.81 Fixed in — No fix listed CNA

CPE names CNA · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.00:::::::*	fw1060.00	—	IBM
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.00.0:::::::*	fw1060.00.0	—	IBM
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.81:::::::*	fw1060.81	—	IBM
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.81.0:::::::*	fw1060.81.0	—	IBM

cpe:2.3:a:ibm:powervm_hypervisor:fw1060.00:*:*:*:*:*:*:* Versions fw1060.00 — ·IBM
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.00.0:*:*:*:*:*:*:* Versions fw1060.00.0 — ·IBM
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.81:*:*:*:*:*:*:* Versions fw1060.81 — ·IBM
cpe:2.3:a:ibm:powervm_hypervisor:fw1060.81.0:*:*:*:*:*:*:* Versions fw1060.81.0 — ·IBM

Remediation

The sources list no fixed version for PowerVM Hypervisor.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-12 Threatist record created from CVE-2026-96266
2026-10-13 Alias added: GHSA-cxch-p56r-27hr
2026-10-13 CISA SSVC decision points changed
2026-10-13 Priority changed: MEDIUM → LOW
2026-10-13 CISA SSVC decision points changed

References

Patch 1

https://www.ibm.com/support/pages/node/7290128

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Sources

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