What is the CVSS score of CVE-2026-23665?

CVE-2026-23665 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Microsoft are affected by CVE-2026-23665?

A heap-based buffer overflow vulnerability in Azure Linux Virtual Machines allows authorized users to escalate privileges locally, potentially granting attackers administrative access to affected…. A patch is available.

How to fix or mitigate CVE-2026-23665?

Within 24 hours: Inventory all Azure Linux VMs and identify which are exposed; disable non-essential local user accounts and review IAM access logs for suspicious activity. Within 7 days: Implement network segmentation to restrict lateral movement from compromised VMs; enable Azure Security Center monitoring and alerts for privilege escalation attempts. Within 30 days: Monitor Microsoft's patch roadmap closely; in parallel, evaluate migration of critical workloads to patched versions or alternative platforms; conduct security assessment of all affected systems.

Microsoft CVE-2026-23665

HIGH

Heap-based Buffer Overflow (CWE-122)

2026-03-10 secure@microsoft.com

Buffer Overflow Heap Overflow Microsoft

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Mar 10, 2026 - 18:18 nvd

HIGH 7.8

DescriptionCVE.org

Heap-based buffer overflow in Azure Linux Virtual Machines allows an authorized attacker to elevate privileges locally.

AnalysisAI

Privilege escalation in Azure Linux Virtual Machines results from a heap-based buffer overflow that authenticated local users can exploit to gain elevated system access. An attacker with valid credentials can trigger memory corruption to bypass privilege restrictions and assume administrative control of the affected virtual machine. No patch is currently available, making this a critical risk for organizations running Azure Linux infrastructure.

Technical ContextAI

Classified as CWE-122 (Heap-based Buffer Overflow). Heap-based buffer overflow in Azure Linux Virtual Machines allows an authorized attacker to elevate privileges locally.