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.
History

Fri, 30 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:5

Fri, 30 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 29 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 29 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation
First Time appeared Redhat
Redhat ceph Storage
Redhat enterprise Linux
Redhat openshift
Redhat openstack
Weaknesses CWE-400
CPEs cpe:/a:redhat:ceph_storage:9
cpe:/a:redhat:openshift:4
cpe:/a:redhat:openstack:13
cpe:/a:redhat:openstack:18.0
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat ceph Storage
Redhat enterprise Linux
Redhat openshift
Redhat openstack
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-29T12:47:18.954Z

Updated: 2026-10-30T07:12:44.289Z

Reserved: 2026-09-17T14:35:34.562Z

Link: CVE-2026-93007

cve-icon Vulnrichment

Updated: 2026-10-29T15:43:45.711Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-29T13:17:15.890

Modified: 2026-10-30T08:17:00.560

Link: CVE-2026-93007

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-28T09:32:00Z

Links: CVE-2026-93007 - Bugzilla