EUVD-2026-63382
GHSA-4885-hmx6-9m68
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only vector, low privileges sufficient to attempt the race, high complexity due to timing dependency; full C/I/A impact on successful exploitation with no scope change.
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 time-of-check to time-of-use (TOCTOU) race condition.
AnalysisAI
Local arbitrary code execution is possible in IBM AIX 7.2 and 7.3 and IBM PowerVM VIOS 4.1 through a TOCTOU race condition (CWE-367), where a low-privileged local attacker can manipulate a resource between its check and its use by a privileged process. The CVSS 7.0 score reflects high confidentiality, integrity, and availability impact, though the high attack complexity (AC:H) indicates the timing window must be won reliably. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session on the affected IBM AIX 7.2/7.3 or PowerVM VIOS 4.1 system with at least low-privilege credentials (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 base score is moderated heavily by AC:H, meaning exploitation is not reliable or trivially automated - the attacker must win a precise timing race, which typically requires significant tuning to the target system's scheduler and load profile. … 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 for both affected products; the authoritative fix details and PTF (program temporary fix) identifiers are documented in the IBM support 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 or PowerVM VIOS 4.1 and document which systems permit local user access. …
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