CVE-2026-93007medium5.3

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

Impact

A flaw in dnsmasq allows a remote attacker to occupy the entire pool of child processes, preventing new TCP DNS connections and DNSSEC validation. The TCP DNS service uses a small fixed pool of child processes and does not set a receive timeout on client connections. UDP DNS resolution continues, and occupied slots are released after a fixed lifetime.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Applies when

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.

What to do

The following measures reduce risk:

Increase the TCP connection limit with --max-tcp-connections=<N> to raise the number of connections an attacker must hold.
Limit per-source TCP connections to port 53 with firewall rules, for example iptables connlimit on tcp/53.
Restrict which hosts can reach TCP port 53 if TCP DNS is not required from untrusted networks.

redhat guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Red Hat · redhat

Red Hat Ceph Storage 9

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:ceph_storage:9

Red Hat · redhat

Red Hat Enterprise Linux 10

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:6

Red Hat · redhat

Red Hat Enterprise Linux 7

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:7

Red Hat · redhat

Red Hat Enterprise Linux 8

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 9

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:9

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 5

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:5

Red Hat · redhat

Red Hat OpenShift Container Platform 5

0 ranges

redhat version evidence

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Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:5

Red Hat · redhat

Red Hat OpenStack Platform 13 (Queens)

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openstack:13

Red Hat · redhat

Red Hat OpenStack Platform 18.0

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openstack:18.0

Original source 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.

Inside the record

Evidence available

Package identity · not supplied

Version evidence · not supplied

Remediation guidance

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-93007

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-400 ↗

Uncontrolled Resource Consumption

redhat

Contributing organizations · 2

redhat

Assigning organization

2026-10-30

CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes

CVE · CVE-2026-930072026-10-30

Observed 2026-10-30T07:20:58.239Z · upstream updated 2026-10-30T07:12:44.289Z

Product or version evidence changed

before

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  },
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    "name": "Red Hat OpenShift Container Platform 4",
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  },
  {
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  {
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    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93007"
  }
]

after

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    "vendor": "Red Hat",
    "name": "Red Hat Ceph Storage 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
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      "cpe:/a:redhat:ceph_storage:9"
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
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  },
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  }
]

CVE · CVE-2026-930072026-10-29

Observed 2026-10-29T17:52:31.282Z · upstream updated 2026-10-29T17:20:12.077Z

Prioritization updated

before

[]

after

[
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-29T15:43:44.687454Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "yes"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

2 sources

access.redhat.com/security/cve/CVE-2026-93007

vdb-entryredhat

bugzilla.redhat.com/show_bug.cgi

issue-trackingredhat

Priority and evidence

Not in CISA KEVNo package fix recorded

KEV coverage does not rule out exploitation.

KEV checked 31/10/2026, 01:50:34 UTC

redhat · CVSS:3.1 · 5.3

Assessment vector

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

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

CISA-ADP · SSVC

CISA Coordinator · 2026-10-29

Exploitation: none
Automatable: yes
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record details

Published: 29/10/2026, 12:47:18 UTC
Modified: 30/10/2026, 07:12:44 UTC
Last imported by cve.new: 30/10/2026, 07:20:58 UTC
Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-93007

Enrichment coverage

NVDNo result

Checked 29/10/2026, 13:05:33 UTC

GHSANo result

Checked 29/10/2026, 13:05:33 UTC

EUVDAvailable

Checked 29/10/2026, 13:05:34 UTC

EPSSNo result

Checked 29/10/2026, 13:05:32 UTC

Additional source evidence

ENISA EUVD · EUVD-2026-112790

CVSS 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Checked 29/10/2026, 13:05:34 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

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

Impact

What to do

Affected packages

Affected products

Red Hat Ceph Storage 9

affected

unaffected

unknown

Red Hat Enterprise Linux 10

affected

unaffected

unknown

Red Hat Enterprise Linux 6

affected

unaffected

unknown

Red Hat Enterprise Linux 7

affected

unaffected

unknown

Red Hat Enterprise Linux 8

affected

unaffected

unknown

Red Hat Enterprise Linux 9

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 5

affected

unaffected

unknown

Red Hat OpenShift Container Platform 5

affected

unaffected

unknown

Red Hat OpenStack Platform 13 (Queens)

affected

unaffected

unknown

Red Hat OpenStack Platform 18.0

affected

unaffected

unknown

Original source description

Inside the record

Evidence available

Original records

Underlying weaknesses

What changed

References