EUVD-2026-63754
GHSA-5pf4-2499-w282
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privilege required to supply crafted filesystem image; full kernel-stack write yields complete C/I/A impact with unchanged scope.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause kernel memory corruption due to insufficient validation. A crafted filesystem image can trigger an out-of-bounds kernel-stack write during directory reads, causing a system crash or potentially enabling privilege escalation.
AnalysisAI
Kernel-stack out-of-bounds write in IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 enables a local attacker with low-privilege shell access to corrupt kernel memory by causing the kernel to parse a crafted filesystem image during directory reads. Successful exploitation can crash the system or escalate privileges to root, yielding full system compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have an authenticated local shell session on the affected AIX 7.2/7.3 or VIOS 4.1 system with at minimum low-privilege user rights (confirmed by PR:L in the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is consistent with a local privilege escalation to full kernel control (C:H/I:H/A:H), but the local attack vector (AV:L) and low-privilege requirement (PR:L) significantly constrain real-world exposure 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 | The primary remediation is to apply the vendor-issued fix documented in the IBM support advisory at https://www.ibm.com/support/pages/node/7283858; an exact patched version number (APAR or iFix identifier) is not specified in the available intelligence and must be obtained directly from that page for the applicable AIX Technology Level or VIOS release. … 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 deployments in your environment and assess which systems permit non-administrator local login access; document affected asset criticality and user populations. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
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