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USN-8659-3: Linux kernel (Azure) vulnerability

unknownpublic exploitCVE-2026-64531
A security issue was discovered in the Linux kernel. An attacker could possibly use this to compromise the system. This update corrects flaws in the following subsystems: - Open vSwitch;

CSIRTS triage

vendor: Linuxproduct: Linux kernel (Azure)Memory corruptionDenial of service
What
A security flaw in the Linux kernel Open vSwitch subsystem allows attackers to compromise the system.
Who is affected
Azure virtual machines and other systems running vulnerable Linux kernel versions with Open vSwitch enabled.
Urgency
Moderate; no active exploitation reported.
Action
Apply the USN-8659-3 kernel security update for Azure environments.

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Details

Source
Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-08-25
Exploitation
Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8659-3

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-64531coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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