EUVD-2026-62738
GHSA-994c-9c72-q3fw
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Adjacent network access required to reach the vulnerable service; no authentication or interaction needed; heap overflow enables full system compromise with no scope change.
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a heap buffer overflow.
AnalysisAI
Heap buffer overflow in IBM AIX 7.2, 7.3 and IBM PowerVM VIOS 4.1 enables unauthenticated adjacent-network attackers to execute arbitrary code on affected systems. The CWE-787 out-of-bounds write flaw carries a CVSS score of 8.8 and yields full confidentiality, integrity, and availability compromise upon successful exploitation. No public exploit code or CISA KEV listing has been identified at time of analysis; however, a vendor-supplied patch is available via IBM support advisory node/7283858.
Technical ContextAI
IBM AIX is a UNIX-based operating system for IBM Power hardware, and IBM PowerVM VIOS (Virtual I/O Server) is the privileged virtualization partition that manages shared I/O resources for guest LPARs on Power systems. Both products are identified via CPE strings cpe:2.3:a:ibm:aix:*:*:*:*:*:*:*:* and cpe:2.3:a:ibm:powervm_vios:*:*:*:*:*:*:*:*. The root cause is CWE-787 (Out-of-bounds Write), specifically a heap buffer overflow - a class of memory corruption flaw where a network-facing process writes beyond the bounds of a heap-allocated buffer. On AIX and VIOS, such overflows in privileged system daemons can overwrite adjacent heap metadata or function pointers, creating a controlled-write primitive that attackers leverage for arbitrary code execution, often at elevated privilege levels.
RemediationAI
A vendor-released patch is available per IBM's support advisory at https://www.ibm.com/support/pages/node/7283858; administrators should apply the relevant AIX 7.2/7.3 and PowerVM VIOS 4.1 fix immediately. The specific patched fileset or Technology Level is not enumerated in the available intelligence - operators must consult the advisory to confirm the exact fix version for their installed Technology Level. As a compensating control pending patch application, restrict network access to affected AIX and VIOS management interfaces and I/O services by placing systems in dedicated, strictly segmented VLANs accessible only to authorized administrators; this directly mitigates the AV:A attack vector by preventing adjacent-network attacker positioning. Disabling or firewalling the specific network-facing service responsible for the overflow - once identified via the IBM advisory - would further reduce exposure. Note that VIOS patch maintenance requires coordination with hosted LPAR workloads and may require scheduled downtime.
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Same weakness CWE-787 – Out-of-bounds Write
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External POC / Exploit Code
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