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IBM PowerVM Hypervisor CVE-2026-15961

| EUVDEUVD-2026-62429 MEDIUM
Use of Externally-Controlled Format String (CWE-134)
2026-08-19 ibm GHSA-8qq5-wpjc-v6g2
Denial Of Service IBM Powervm Hypervisor
6.0
CVSS 3.1 · NVD
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Severity by source

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

Local-only format string flaw requiring high-privilege hypervisor access and high complexity; A:H reflects hypervisor crash potential, C:L and I:L for limited memory read and possible write via format specifiers.

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

Primary rating from Vendor (ibm).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

2
CVSS changed
Aug 25, 2026 - 20:37 NVD
5.2 (MEDIUM) 6.0 (MEDIUM)
Analysis Generated
Aug 19, 2026 - 15:13 vuln.today

DescriptionNVD

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 could allow a local attacker to obtain sensitive information or cause a denial of service due to improper control of format strings.

AnalysisAI

IBM PowerVM Hypervisor across firmware branches FW1060, FW1110, and FW1120 contains a format string vulnerability (CWE-134) that enables a local attacker with high-privilege access to extract sensitive hypervisor memory or trigger a denial-of-service condition crashing the hypervisor and all hosted virtual machines. The attack requires local presence, high privileges, and high attack complexity, confining realistic risk to insider threat or post-compromise scenarios. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires an attacker to already possess high-privilege local access to the IBM PowerVM system (PR:H per CVSS vector) - specifically administrative or equivalent control over hypervisor-level interfaces. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 5.2 Medium score is well-calibrated for this vulnerability. … 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 IBM has confirmed a patch is available; administrators should consult the vendor advisory at https://www.ibm.com/support/pages/node/7283228 to obtain the specific fixed firmware versions for their release train (FW1060, FW1110, or FW1120) and schedule firmware updates accordingly. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-15961 vulnerability details – vuln.today
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