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.
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Affected Vendors & Products
References
History
Fri, 30 Oct 2026 07:30:00 +0000
| Type | Values Removed | Values Added |
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| CPEs | cpe:/a:redhat:openshift:5 |
Fri, 30 Oct 2026 00:30:00 +0000
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threat_severity
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threat_severity
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Thu, 29 Oct 2026 18:30:00 +0000
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ssvc
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Thu, 29 Oct 2026 13:00:00 +0000
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| 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 |
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| 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 |
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| Vendors & Products |
Redhat
Redhat ceph Storage Redhat enterprise Linux Redhat openshift Redhat openstack |
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cvssV3_1
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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
Updated: 2026-10-29T15:43:45.711Z
Status : Awaiting Analysis
Published: 2026-10-29T13:17:15.890
Modified: 2026-10-30T08:17:00.560
Link: CVE-2026-93007