5.3
MediumCVSS 3.1 · from redhat
CVE-2026-93007
Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation
rhceph/alloy-rhel10 · Uncontrolled resource use · CWE-400Affectedopenshift/ose-rhel-coreos-9, rhceph/alloy-rhel10, dnsmasq and 11 more
FixNo fix listed yet.
PublishedOct 29, 12:47 · redhat
ScoredOct 29 · 5.3 · redhat
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:05 UTC
What we know
No known exploitation. CISA KEV, checked 22:05 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
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.
From redhat
Affected and fixed versions
ProductAffectedFixed inopenshift/ose-rhel-coreos-9all versions–rhceph/alloy-rhel10all versions–dnsmasqall versions–dnsmasqall versions–dnsmasqall versions–dnsmasqall versions–dnsmasqall versions–openshift4/ose-baremetal-runtimecfg-rhel8all versions–openshift4/ose-baremetal-runtimecfg-rhel9all versions–openshift/ose-rhel-coreos-8all versions–openshift5/ose-baremetal-runtimecfg-rhel9all versions–openshift/ose-rhel-coreos-9all versions–dnsmasqall versions–rhoso-operators/infra-rhel9-operatorall versions–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known