What is CVE-2026-23665?

CVE-2026-23665 is a high-severity vulnerability in Microsoft Azure Linux Virtual Machines With Diagnostics Extension, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-03-10.

How severe is CVE-2026-23665?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Microsoft Azure Linux Virtual Machines With Diagnostics Extension

CVE-2026-23665

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

Vulnerability class: Buffer Overflow

Published 2026-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.0th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Microsoft Azure Linux Virtual Machines With Diagnostics Extension — versions 1.0.0
Microsoft Linux Diagnostic Extension

Weakness classification (CWE)

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23665 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-23665?: CVE-2026-23665 is a high-severity vulnerability in Microsoft Azure Linux Virtual Machines With Diagnostics Extension, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-03-10.
How severe is CVE-2026-23665?: High severity. CVSS v3 base score is 7.8 out of 10.