CVE-2026-96263: CWE-121 Stack-based Buffer Overflow in IBM PowerVM Hypervisor
Description
A stack-based buffer overflow vulnerability exists in the host firmware boot process image validation path of IBM Power Systems Firmware versions FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81. An attacker with service access to the service processor can supply a malicious code update image, potentially leading to arbitrary code execution on the host system. This could impact confidentiality, integrity, and availability of the affected system.
CVSS v3.1
Score 8.2high
Affected software
IBM
PowerVM Hypervisor
cpe:2.3:a:ibm:powervm_hypervisor:fw1120.00:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_hypervisor:fw1120.00.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_hypervisor:fw1120.01:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_hypervisor:fw1120.01.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_hypervisor:fw1110.00:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_hypervisor:fw1110.00.0:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-96263 is a stack-based buffer overflow vulnerability (CWE-121) in the IBM PowerVM Hypervisor's host firmware boot process image validation path. The affected firmware versions include FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81. An attacker with service access to the service processor can exploit this by providing a maliciously crafted code update image, enabling arbitrary code execution on the host system. The vulnerability has a CVSS 3.1 base score of 8.2, indicating high severity with impacts to confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an attacker with service processor access to execute arbitrary code on the host system, potentially compromising confidentiality, integrity, and availability of the affected IBM Power Systems host.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-09-22T20:14:24.422Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acd4b482cdf04f656d3ef78
Added to database: 10/12/2026, 21:04:08 UTC
Last enriched: 10/12/2026, 21:18:32 UTC
Last updated: 10/12/2026, 21:19:03 UTC
Views: 7
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