EUVD-2026-62531
GHSA-vf7p-vx9f-2xvg
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
TOCTOU exploitation requires winning a kernel-level timing race, making AC:H more accurate; all other metrics from the vendor vector are retained.
Primary rating from Vendor (ibm).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service and compromise data integrity due to a time-of-check time-of-use race condition.
AnalysisAI
IBM AIX 7.2 and 7.3, along with IBM PowerVM VIOS 4.1, expose a time-of-check time-of-use (TOCTOU) race condition that local, unprivileged attackers can exploit to corrupt data integrity or crash the system. The flaw requires only local shell access with no privileges, making it exploitable by any local user account on affected POWER-architecture systems. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local shell access on an IBM AIX 7.2/7.3 host or a PowerVM VIOS 4.1 management partition is required (AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 score of 7.7 (AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H) warrants scrutiny. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local user on an IBM AIX system - for example, a developer account or a compromised service account - runs a crafted script that repeatedly invokes a system operation subject to the TOCTOU window, racing to swap or modify the underlying resource between the kernel's check and its subsequent use. Successful exploitation either corrupts a target file or data structure (integrity impact) or triggers a kernel panic or resource exhaustion (denial of service). … |
| Remediation | Apply the patch provided by IBM per advisory node/7283858 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 in production and identify which host mission-critical workloads or sensitive data. …
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Same technique Denial Of Service
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External POC / Exploit Code
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