EUVD-2026-62523
GHSA-9cp7-9wgf-vgfj
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable unauthenticated crash with no complexity barrier; C:N/I:N because impact is strictly availability via memory corruption 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 cause a denial of service due to an out-of-bounds write.
AnalysisAI
Remote denial-of-service in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 is caused by a CWE-787 out-of-bounds write reachable by unauthenticated network attackers with no complexity prerequisites. The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects straightforward remote triggering with high availability impact but no confidentiality or integrity consequence. IBM has released a patch via the vendor advisory; no public exploit code has been identified at time of analysis.
Technical ContextAI
CWE-787 (Out-of-Bounds Write) describes a condition where a program writes data beyond the boundaries of an allocated memory buffer, corrupting adjacent memory regions. In this case, the flaw resides in IBM AIX - IBM's enterprise Unix operating system designed for POWER architecture hardware - and in PowerVM VIOS (Virtual I/O Server), a specialized AIX-based hypervisor partition that proxies storage and network I/O to logical partitions on IBM Power systems. The network-accessible nature of the flaw (AV:N) indicates the vulnerable code path lies in a service or protocol handler that processes externally supplied input. Out-of-bounds writes in kernel or privileged service contexts on AIX typically manifest as panics or process termination rather than code execution, which is consistent with the purely availability-focused impact vector. Affected CPEs are cpe:2.3:a:ibm:aix:*:*:*:*:*:*:*:* and cpe:2.3:a:ibm:powervm_vios:*:*:*:*:*:*:*:*.
RemediationAI
Apply the IBM-released fix documented at https://www.ibm.com/support/pages/node/7283858, which provides APAR numbers and interim fix packages for AIX 7.2, AIX 7.3, and PowerVM VIOS 4.1; exact patched build levels are not included in this analysis dataset and must be obtained from the advisory directly. As an interim measure prior to patching, restrict network access to affected AIX and VIOS systems at the perimeter or host-based firewall level to limit which hosts can reach the vulnerable network-facing service - note that overly broad VIOS network restriction may degrade I/O throughput or connectivity for dependent logical partitions and should be scoped carefully. If the specific vulnerable service can be identified from the IBM advisory, disabling or isolating it is a more targeted interim control with lower operational risk than broad network filtering.
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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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