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CVE-2026-80668: netfilter: nf_conntrack_expect: use conntrack GC to reap expectations

highCVSS 7.1CVE-2026-80668

CSIRTS triage

vendor: Linuxproduct: Linux kernelDenial of service
What
The netfilter nf_conntrack_expect module does not properly garbage collect connection expectations, leading to memory exhaustion and denial of service.
Who is affected
Linux systems running netfilter conntrack expectation tracking, especially under high connection volume.
Urgency
High priority; memory exhaustion attack can be triggered to deny service; prompt patching is warranted.
Action
Apply kernel security patch promptly when available or reduce conntrack expectation limits.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.1
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80668

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-2026-80668coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for netfilter

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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