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CVE-2026-52909: ip6_vti: set netns_immutable on the fallback device.

highCVSS 7.8CVE-2026-52909

CSIRTS triage

Other
What
The ip6_vti module does not set netns_immutable on the fallback device.
Who is affected
Users of the ip6_vti module.
Urgency
Remediation is urgent due to the high severity of the issue, although no exploitation has been reported.
Action
Update the ip6_vti module to set netns_immutable correctly.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52909

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-2026-52909coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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