EUVD-2026-63727
GHSA-6j4h-jc88-6hwv
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privileges confirmed by description; AC:L because symlink placement requires no race precision beyond standard TOCTOU setup; C:H because overwriting auth files enables confidentiality breach.
Primary rating from Vendor (us).
CVSS VectorVendor: us
Lifecycle Timeline
2DescriptionCVE.org
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to overwrite arbitrary files due to improper resolution of symbolic links.
AnalysisAI
Symlink following in IBM AIX 7.2, 7.3 and IBM PowerVM VIOS 4.1 allows a local low-privileged attacker to overwrite arbitrary files on the system, including those owned by root. The flaw stems from improper resolution of symbolic links (CWE-59) during privileged file operations, enabling integrity and availability impacts equivalent to a high-severity local privilege escalation primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local user account on the affected IBM AIX 7.2/7.3 or PowerVM VIOS 4.1 system with the ability to create files or symlinks in a directory accessible to the vulnerable privileged operation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H indicates local exploitation requiring only a standard user account (PR:L) with low attack complexity (AC:L) and no user interaction. … 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 | The primary remediation is to apply the IBM-issued fixes detailed at https://www.ibm.com/support/pages/node/7283858, which should specify the required AIX APAR or Technology Level and the VIOS fix bundle. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of AIX 7.2, 7.3, and PowerVM VIOS 4.1 deployments across production and non-production environments to establish exposure scope. …
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Same weakness CWE-59 – Improper Link Resolution Before File Access
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External POC / Exploit Code
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