EUVD-2026-63679
GHSA-mfv6-ph6j-4w5v
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only heap overflow exploitable by any low-privileged account; full CIA impact on the vulnerable host; no scope change as exploitation is contained within the OS 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 buffer overflow.
AnalysisAI
Local privilege escalation in IBM AIX 7.2, 7.3 and IBM PowerVM VIOS 4.1 via heap buffer overflow (CWE-787) enables an authenticated local attacker with standard user-level access to gain elevated - potentially root - privileges on affected systems. The CVSS 7.8 High score reflects full confidentiality, integrity, and availability impact despite the local attack vector, making this a serious insider-threat and post-compromise escalation risk. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local account on the affected IBM AIX 7.2/7.3 or PowerVM VIOS 4.1 system with at minimum low OS-level privileges (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a high-severity local privilege escalation: reliably exploitable, requiring only a low-privileged shell account, with full impact across confidentiality, integrity, and availability. … 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 | Apply the vendor-released patch documented in IBM's security 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: Identify all systems running IBM AIX 7.2, 7.3, or PowerVM VIOS 4.1 and document user access levels, prioritizing systems with sensitive data or elevated-privilege accounts. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
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