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CVE-2026-93007— Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation

Quick assessment

Affected
Red Hat Red Hat Ceph Storage 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 dnsmasq 中发现一个安全漏洞。其 TCP DNS 服务使用一个较小的固定子进程池，且未对客户端连接设置接收超时机制。远程攻击者可以向 53 端口建立空闲的 TCP 连接，从而耗尽整个子进程池，阻止新的 TCP DNS 连接建立，并影响依赖 TCP 回退机制的 DNSSEC 验证。UDP DNS 解析仍可正常工作，被占用的连接槽位会在固定的生命周期结束后自动释放。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-93007

Vulnerability Information
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Vulnerability Title
Dnsmasq: dnsmasq: tcp/53 child-slot exhaustion starves dnssec validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Ceph Storage 9 - cpe:/a:redhat:ceph_storage:9
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenStack Platform 13 (Queens) - cpe:/a:redhat:openstack:13
Red Hat Red Hat OpenStack Platform 18.0 - cpe:/a:redhat:openstack:18.0

II. Public POCs for CVE-2026-93007

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III. Intelligence Information for CVE-2026-93007

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Other References for CVE-2026-93007 (2)

Same Patch Batch · Red Hat · 2026-10-29 · 16 CVEs total

CVE-2026-114488 7.4 HIGH Wildfly: wildfly-iiop: wildfly-ejb3: wildfly: authentication bypass on iiop ejb invocation
CVE-2026-15564 7.4 HIGH Wildfly-ejb: wildfly-iiop-openjdk: eap iiop listeners may permit unauthed deserialization
CVE-2026-118425 6.8 MEDIUM Keycloak-services: keycloak-services: redirect uri domain allowlist bypass via dns resolut
CVE-2026-93006 6.8 MEDIUM Dnsmasq: dnsmasq: tftp prefetch cache keyed on stale heap pointer serves wrong file conten
CVE-2026-93008 6.8 MEDIUM Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns config
CVE-2026-117548 6.5 MEDIUM 389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schem
CVE-2026-19610 6.5 MEDIUM Wildfly-platform-mbean: wildfly-platform-mbean: rbac sensitive attribute read bypass for p
CVE-2026-117859 5.4 MEDIUM Keycloak-services: keycloak-services: par single-use bypass via flow restart
CVE-2026-117627 5.4 MEDIUM Keycloak-services: keycloak-services: jwt authorization grant bypasses identity provider l
CVE-2026-93011 5.3 MEDIUM Dnsmasq: dnsmasq: heap out-of-bounds write in dnssec validator via to_wire/from_wire trans
CVE-2026-117688 5.3 MEDIUM Keycloak-services: keycloak-services: vault secret disclosure via client registration inst
CVE-2026-93009 4.3 MEDIUM Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoder
CVE-2026-93010 4.3 MEDIUM Dnsmasq: dnsmasq: --leasequery without address argument applies no source address check
CVE-2026-118030 4.2 MEDIUM Keycloak-services: keycloak-services: hotp race condition allows single otp code reuse acr
CVE-2026-85498 3.5 LOW Polkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow

IV. Related Vulnerabilities

Same product: Red Hat Ceph Storage 9
Same vendor: Red Hat
Same weakness: CWE-400