EUVD-2026-63703
GHSA-g747-xq79-c6qm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local-only TOCTOU race (AV:L, AC:H) requires authenticated user (PR:L); no confidentiality impact; symlink redirection enables file corruption and availability loss (I:H, A:H).
Primary rating from Vendor (ibm).
CVSS VectorNVD
Lifecycle Timeline
3DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service due to improper validation of symbolic links.
AnalysisAI
Symlink following vulnerability in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows a local low-privileged attacker to cause a denial of service - and potentially file corruption - through improper symbolic link validation (CWE-59). The CVSS vector (AV:L/AC:H/PR:L/I:H/A:H) indicates exploitation requires local access, a race-condition timing window, and results in both high integrity and availability impact despite the DoS classification. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user account on the affected system (CVSS PR:L confirmed). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.3 Medium score is shaped primarily by two mitigating metrics: AV:L (local access only) and AC:H (high attack complexity), which together substantially reduce the exploitable population compared to network-facing vulnerabilities. … 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 IBM-issued patch documented in the vendor advisory at https://www.ibm.com/support/pages/node/7283858. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-59 – Improper Link Resolution Before File Access
View allSame technique Denial Of Service
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External POC / Exploit Code
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