EUVD-2026-63678
GHSA-5grv-2mch-f23m
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privilege access required per description; stack overflow is low-complexity to trigger; full C/I/A impact from arbitrary code execution; no scope change as VIOS impact remains within the exploited system 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 execute arbitrary code due to a stack-based buffer overflow.
AnalysisAI
Stack-based buffer overflow in IBM AIX 7.2 and 7.3, and IBM PowerVM VIOS 4.1 enables a local low-privileged attacker to execute arbitrary code, achieving full system compromise (C:H/I:H/A:H). The attack requires only a local account with standard user privileges and no user interaction, making post-authentication lateral movement or privilege escalation a realistic threat in IBM Power-based enterprise environments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local user account with at minimum standard (low) privileges on the affected IBM AIX 7.2/7.3 or PowerVM VIOS 4.1 system, as confirmed by CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 with AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects the risk profile: local exploitation with low complexity and no user interaction, yielding full system control. … 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 | IBM has released a patch addressing this vulnerability; apply the fix levels described 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 IBM AIX 7.2, 7.3, and PowerVM VIOS 4.1 systems across production and non-production environments to determine affected asset scope. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
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External POC / Exploit Code
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