5.3
Medium
CVE-2026-93007 Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitable remotely over the network, without an account and without any user action; the impact on data or service is limited.
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- Interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Ceph Storage 9 | Versions not published | |
| Red Hat Enterprise Linux 10 | Versions not published | |
| Red Hat Enterprise Linux 6 | Versions not published | |
| Red Hat Enterprise Linux 7 | Versions not published | |
| Red Hat Enterprise Linux 8 | Versions not published | |
| Red Hat Enterprise Linux 9 | Versions not published | |
| Red Hat OpenShift Container Platform 4 | Versions not published | |
| Red Hat OpenStack Platform 13 (Queens) | Versions not published | |
| Red Hat OpenStack Platform 18.0 | Versions not published |
Show the other branch Hide the other branch
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat OpenShift Container Platform 5 | Versions not published |
References
- access.redhat.com access.redhat.com
- RHBZ#2536076 bugzilla.redhat.com
Timeline
- Published
- Last modified
Other CVEs of Red Hat Ceph Storage 9
The 38 CVEs of Red Hat Ceph Storage 9 →
CVE-2026-93009
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4.3
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CVE-2026-93010
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CVE-2026-93006
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CVE-2026-93011
Dnsmasq: dnsmasq: heap out-of-bounds write in dnssec validator via to_wire/from_wire transforms
5.3
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