Medium 5.3Published Oct 29, 2026

CVE-2026-93007Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation

Updated under an hour ago (Oct 30, 2026, 4:50 AM ET)

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It affects Red Hat Ceph Storage 9 and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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A flaw was found in dnsmasq. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. A remote attacker can open idle TCP connections to port 53 and occupy the entire pool, preventing new TCP DNS connections and DNSSEC validation that requires TCP fallback. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Oct 30, 2026
First seen by InfoSec Signals: Oct 29, 2026

Affected products

Affected products

Red Hat Red Hat Ceph Storage 9 redhat:ceph_storage	9	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CNA record
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CNA record
Red Hat Red Hat OpenStack Platform 13 (Queens) redhat:openstack	13	CNA record

References

References

https://access.redhat.com/security/cve/CVE-2026-93007	vdb-entry, x-refsource-redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2536076	issue-tracking, x-refsource-redhat

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.