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CVE-2026-53218: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag

highCVSS 7CVE-2026-53218

CSIRTS triage

Other
What
This vulnerability relates to register tracking for the F_PRESENT flag in netfilter.
Who is affected
Users of affected netfilter configurations are at risk.
Urgency
High urgency for remediation due to a CVSS score of 7 and potential impact.
Action
Apply relevant updates to netfilter to fix this issue.

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
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53218

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-2026-53218coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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