EUVD-2026-63632
GHSA-8rm2-2jmf-rx4j
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local vector and low-privilege requirement match a local code execution flaw; scope change reflects potential VIOS-to-hypervisor or cross-LPAR impact with full CIA consequences.
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to an integer underflow.
AnalysisAI
Arbitrary code execution in IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 is enabled by an integer underflow that triggers an out-of-bounds memory write, allowing a local low-privileged attacker to execute code with elevated or host-level impact. The CVSS Scope:Changed metric indicates exploitation may allow breakout beyond the initially compromised component - particularly significant in PowerVM VIOS, where a VIOS partition compromise could affect the underlying hypervisor or other hosted LPARs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an attacker to have an existing local user account with interactive login access (shell access) on the affected AIX 7.2/7.3 or PowerVM VIOS 4.1 system - reflected in 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 S:C (Scope Changed) and full C:H/I:H/A:H triad, despite requiring local access (AV:L) with low privileges (PR:L). … 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 vendor-released patch documented in IBM's advisory at https://www.ibm.com/support/pages/node/7283858. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running IBM AIX 7.2, 7.3, and PowerVM VIOS 4.1 and assess their criticality; contact IBM for the specific patch version and plan maintenance windows. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
View allShare
External POC / Exploit Code
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