EUVD-2026-62869
GHSA-99p8-3qr2-4qg3
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local low-privilege access required to reach vulnerable code; OOB read yields high confidentiality impact with no write capability or DoS; scope remains unchanged.
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 local attacker to obtain sensitive information due to an out-of-bounds read.
AnalysisAI
Out-of-bounds memory read in IBM AIX 7.2 and 7.3, and IBM PowerVM VIOS 4.1 exposes sensitive system memory to locally authenticated users holding low-privilege accounts. The flaw (CWE-125) allows an attacker with existing local access to read memory contents beyond intended buffer boundaries, producing high confidentiality impact while leaving system integrity and availability unaffected. No public exploit code or CISA KEV listing has been identified at time of analysis; IBM has released a patch via advisory 7283858.
Technical ContextAI
The root cause is CWE-125 (Out-of-Bounds Read), a memory-safety defect class in which a program reads data past the allocated end of a buffer, potentially exposing adjacent memory contents to the caller. IBM AIX is a proprietary UNIX-based operating system running on IBM Power hardware, and IBM PowerVM VIOS (Virtual I/O Server) is the hypervisor management partition that abstracts physical I/O resources for guest LPARs - both share kernel-level code paths that may process locally supplied input. The affected CPE strings (cpe:2.3:a:ibm:aix:*:*:*:*:*:*:*:* and cpe:2.3:a:ibm:powervm_vios:*:*:*:*:*:*:*:*) use wildcard subversion ranges, indicating IBM has not publicly narrowed exposure below the major release level in the available data. The tags characterize this as 'Buffer Overflow,' but CWE-125 is correctly a read-side memory safety issue - distinct from write-side buffer overflows that enable code execution - meaning the realistic impact is information disclosure rather than arbitrary code execution.
RemediationAI
Apply the vendor-released patch documented in IBM security advisory 7283858, available at https://www.ibm.com/support/pages/node/7283858. The exact patched version numbers must be confirmed directly from the advisory, as the CPE wildcard ranges in the available data do not specify a precise fix version and none was independently provided in the source intelligence. As a compensating control where immediate patching is not feasible, restrict local shell and administrative access on all AIX 7.2/7.3 and VIOS 4.1 systems to only explicitly authorized personnel, and audit user account assignments and sudoers configurations to minimize the pool of low-privilege accounts that could trigger the vulnerable code path. Note that access restriction reduces the likelihood of unauthorized exploitation but does not remediate the underlying memory safety defect - patching remains the definitive fix.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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