CVE-2026-93007 Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-93007?
CVE-2026-93007 is a medium-severity vulnerability in Red Hat Ceph Storage 9, published on 29 Oct 2026.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2026-93007?
How do I fix CVE-2026-93007?
No fix has been published for CVE-2026-93007 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93007 being exploited?
There is no known exploitation of CVE-2026-93007 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93007, GHSA-2frf-fr59-fcjq.