EUVD-2026-63728
GHSA-f7rf-548q-x8f3
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Local access with low privilege required, no C/I impact, high availability loss with scope change consistent with VIOS crash affecting co-hosted LPARs.
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 cause a denial of service due to an out-of-bounds write.
AnalysisAI
Out-of-bounds write in IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 enables a local, low-privileged attacker to crash the affected system, resulting in a denial of service. The CVSS scope-change metric (S:C) is particularly significant in the PowerVM context: a crash of the VIOS host can simultaneously disrupt I/O services for all co-hosted guest logical partitions (LPARs) sharing that VIOS, amplifying the blast radius well beyond the directly exploited node. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session on an IBM AIX 7.2/7.3 or PowerVM VIOS 4.1 system with at least low-privilege access (PR:L per CVSS vector) - the attacker must be able to execute code on the target host. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 Medium base score reflects a local, low-complexity, low-privilege attack with no confidentiality or integrity impact but a high availability consequence and changed scope. … 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 vendor-supplied fix documented in the IBM advisory at https://www.ibm.com/support/pages/node/7283858; the exact patched AIX Technology Level or VIOS fix pack version must be retrieved directly from that advisory, as it was not independently confirmed in available data - do not infer fix versions from this analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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