EUVD-2026-63670
GHSA-g36v-cxwq-2vjf
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local low-privilege user triggers heap overflow with no complexity or interaction; S:C reflects privilege escalation crossing into OS or hypervisor trust boundary.
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 gain elevated privileges due to a heap-based buffer overflow.
AnalysisAI
Privilege escalation via heap-based buffer overflow affects IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1, enabling a local attacker with standard user-level access to gain elevated - potentially root-level - privileges on the affected system. The CVSS scope-changed (S:C) rating confirms that successful exploitation extends control beyond the attacker's initial security context, threatening the entire host including virtual machine management infrastructure on PowerVM. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:L/PR:L) confirms exploitation requires a local user session with at least low-privilege access - the attacker must have a valid OS account with interactive or programmatic access to the affected IBM AIX or PowerVM VIOS system. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 High score is grounded in a meaningful set of signals: local access with low-privilege authentication (AV:L/PR:L), low attack complexity (AC:L), no user interaction required (UI:N), and a scope change (S:C) with full confidentiality, integrity, and availability impact. … 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; patch availability is confirmed per vendor, though the exact patched version number is not independently verifiable from the data provided. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct inventory of all IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 systems across your infrastructure and implement access restrictions for standard user accounts. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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