CVE-2026-64079: netfilter: x_tables: allocate hook ops while under mutex

criticalCVSS 9.8CVE-2026-64079

CSIRTS triage

Other

What: The netfilter x_tables may allocate hook operations while under mutex.
Who is affected: Deployments using netfilter x_tables.
Urgency: Remediation is high urgency due to the critical severity of the issue.
Action: Apply the patch for CVE-2026-64079.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64079

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-2026-640790.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64079	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highUSN-8618-1: Linux kernel vulnerabilitiesubuntu
highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
highUSN-8593-1: Linux kernel vulnerabilitiesubuntu
unknownCVE-2026-64079: In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: alloc…nvd

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-2026-64554: In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: fix sta…nvd · 2026-07-27
highCVE-2026-64414: In the Linux kernel, the following vulnerability has been resolved: netfilter: handle unreadab…nvd · 2026-07-25
highCVE-2026-64413: In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero …nvd · 2026-07-25
highCVE-2026-64412: In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: modul…nvd · 2026-07-25
highCVE-2026-64411: In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: termi…nvd · 2026-07-25
criticalCVE-2026-64410: In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: IPIP…nvd · 2026-07-25