CVE-2026-74624: netfilter: nf_conntrack: defer invalid log until after unlock

mediumCVSS 5.9CVE-2026-74624

CSIRTS triage

vendor: Linux product: Linux Denial of service

What: Netfilter nf_conntrack defers invalid log operations until after releasing locks, preventing potential deadlock or log corruption.
Who is affected: Linux systems running netfilter with connection tracking enabled.
Urgency: Moderate; CVSS 5.9 and deadlock potential warrant timely remediation.
Action: Apply kernel patch or upgrade to a Linux version with the nf_conntrack locking fix.

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: medium — CVSS 5.9
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74624

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.

Low exploitation riskCVE-2026-746240.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74624	coverage & exploitation status	NVD · 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.

highCVE-2026-74695: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_flow_table: …nvd · 2026-08-22
highCVE-2026-74660: In the Linux kernel, the following vulnerability has been resolved: netfilter: ebt_nflog: pin …nvd · 2026-08-22
highCVE-2026-74625: In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: release…nvd · 2026-08-22
highCVE-2026-74624: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: d…nvd · 2026-08-22
unknownCVE-2026-74579: In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_payload: fi…nvd · 2026-08-17
criticalCVE-2026-74569: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_si…nvd · 2026-08-15