Denial of Service Vulnerability in dnsmasq TCP DNS Service
CVE-2026-93007

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Ceph Storage 9
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Vendor
CVE Published:
29 October 2026

What is CVE-2026-93007?

A flaw in dnsmasq's TCP DNS service allows remote attackers to exploit the fixed pool of child processes and create idle connections, occupying the entire pool. This prevents new TCP DNS connections and disrupts DNSSEC validation that relies on TCP fallback. While UDP DNS resolution remains operational, slots filled by idle connections are only released after a predetermined timeout, affecting overall service availability.

References

https://access.redhat.com/security/cve/CVE-2026-93007
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536076
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue.
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