CVE-2026-93007

MEDIUM 5.3

Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400
Vendor	red hat
Product	red hat ceph storage 9
Published	Oct 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

Red Hat / Red Hat Ceph Storage 9

All versions affected

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4

All versions affected

Red Hat / Red Hat OpenStack Platform 13 (Queens)

All versions affected

Red Hat / Red Hat OpenStack Platform 18.0

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

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