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IBM AIX EUVDEUVD-2026-62869

| CVE-2026-16883 MEDIUM
Out-of-bounds Read (CWE-125)
2026-08-19 ibm GHSA-99p8-3qr2-4qg3
5.5
CVSS 3.1 · NVD
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Severity by source

Vendor (ibm) PRIMARY
MEDIUM
qualitative
NVD
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
5.5 MEDIUM

Local low-privilege access required to reach vulnerable code; OOB read yields high confidentiality impact with no write capability or DoS; scope remains unchanged.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (ibm).

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Aug 19, 2026 - 21:01 vuln.today
CVE Published
Aug 19, 2026 - 19:44 nvd
MEDIUM 5.5

DescriptionNVD

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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege local account on AIX or VIOS host
Exploit
Craft input triggering vulnerable code path
Execution
Trigger out-of-bounds read in kernel/privileged component
Impact
Extract sensitive data from leaked memory contents

Vulnerability AssessmentAI

Exploitation Exploitation requires a local authenticated account on the affected IBM AIX 7.2, AIX 7.3, or PowerVM VIOS 4.1 system with at minimum low-privilege access, consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 5.5 (Medium) correctly reflects the constrained attack surface: AV:L limits exploitation to actors already present on the system, and PR:L requires at minimum a valid low-privilege local account, ruling out unauthenticated or remote opportunistic attacks. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privilege local user on an IBM AIX 7.2 or 7.3 host crafts a request - such as a malformed system call argument or specially constructed input to a setuid/privileged binary - that triggers the out-of-bounds read, causing the OS to return memory contents from beyond the intended buffer boundary. The leaked memory region may include sensitive data belonging to other processes, kernel data structures, or cryptographic material resident in memory at the time of the read. …
Remediation Apply the vendor-released patch documented in IBM security advisory 7283858, available at https://www.ibm.com/support/pages/node/7283858. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-62869 vulnerability details – vuln.today

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