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Solution
No solution given by the vendor.
Workaround
The following measures reduce risk: 1. Increase the TCP connection limit with --max-tcp-connections=<N> to raise the number of connections an attacker must hold. 2. Limit per-source TCP connections to port 53 with firewall rules, for example iptables connlimit on tcp/53. 3. Restrict which hosts can reach TCP port 53 if TCP DNS is not required from untrusted networks.
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 |
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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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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-10-29T12:47:18.954Z
Reserved: 2026-09-17T14:35:34.562Z
Link: CVE-2026-93007
No data.
Status : Awaiting Analysis
Published: 2026-10-29T13:17:15.890
Modified: 2026-10-29T13:17:16.000
Link: CVE-2026-93007
No data.
OpenCVE Enrichment
No data.