CVE-2026-18871

Power System Buffer Overflow

State: Published
Severity: 7.3 High
Published: Aug 19, 2026
Updated: Aug 20, 2026
Reserved: Aug 4, 2026

Description

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 is affected by 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 initialisation, resulting in an integrity and availability impact to the managed system.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H	ibm

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
PowerVM HypervisorIBM	FW1120.00Affected FW1110.00 through FW1110.30Affected FW1060.00 through FW1060.80Affected

References

https://www.ibm.com/support/pages/node/7283238vendor-advisorypatch

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