EUVD-2026-63750
GHSA-mrg6-q394-8jmx
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local access with low-privilege LPAR account (AV:L, PR:L); scope change (S:C) justified by potential VIOS compromise affecting co-hosted LPARs.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 has a pointer validation flaw exists in the AIX Virtual SCSI (vSCSI) initiator driver. Successful exploitation may result in denial of service, privilege escalation, or full compromise of the client LPAR kernel.
AnalysisAI
Untrusted pointer dereference (CWE-822) in IBM AIX's Virtual SCSI (vSCSI) initiator driver allows a low-privileged local user within a client LPAR to trigger kernel memory corruption, with outcomes spanning denial of service, privilege escalation, or full compromise of the client LPAR kernel. Affecting IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1, the CVSS 3.1 score of 8.8 with scope change (S:C) reflects the cross-LPAR isolation risk inherent in PowerVM virtualization environments where VIOS mediates I/O for multiple tenants. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local operating system account within a client LPAR running IBM AIX 7.2 or 7.3, with at minimum low-privilege (standard user) access - confirmed by the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score is driven primarily by the changed scope and full C/I/A triad, which accurately represents the cross-boundary risk in PowerVM multi-tenant deployments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply the IBM-supplied fix documented at https://www.ibm.com/support/pages/node/7283858; administrators should reference that advisory directly to identify the correct APAR or fix pack for their specific AIX 7.2, AIX 7.3, or VIOS 4.1 installation, as exact patched sub-version numbers are not specified in the data available for this analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Complete an inventory of all AIX 7.2, 7.3, and PowerVM VIOS 4.1 systems, documenting which host production workloads and their exposure to local users. …
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Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Privilege Escalation
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External POC / Exploit Code
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