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USN-8659-2: Linux kernel (HWE) 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 kernelDenial of serviceMemory corruptionOther
What
Security flaw in Open vSwitch subsystem.
Who is affected
Systems running affected Linux kernel HWE versions with Open vSwitch enabled.
Urgency
Severity unknown; apply as part of regular patch management.
Action
Apply kernel security updates provided by distribution maintainer.

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Details

Source
Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-08-21
Exploitation
Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8659-2

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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