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Vulnerability · Published Oct 29, 2026 · Assigned by redhat

CVE-2026-93006Dnsmasq: dnsmasq: tftp prefetch cache keyed on stale heap pointer serves wrong file content

Medium 6.8

In plain English

A medium-severity security flaw in Red Hat Ceph Storage 9 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)0.3%top 76.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in dnsmasq. The TFTP server can serve the wrong file contents because a recently used transfer cache is not invalidated when a transfer finishes. An attacker on the local network who can request a TFTP file may cause a later client to receive previously cached data instead of the requested file. In PXE network-boot environments this can substitute attacker-chosen boot content for a victim machine.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12dnsmasqno fix listedDEBIAN-CVE-2026-93006
Debian:13dnsmasqno fix listedDEBIAN-CVE-2026-93006
Debian:14dnsmasqno fix listedDEBIAN-CVE-2026-93006
Ubuntu:22.04:LTSdnsmasqno fix listedUBUNTU-CVE-2026-93006
Ubuntu:24.04:LTSdnsmasqno fix listedUBUNTU-CVE-2026-93006
Ubuntu:26.04:LTSdnsmasqno fix listedUBUNTU-CVE-2026-93006
Ubuntu:26.10dnsmasqno fix listedUBUNTU-CVE-2026-93006

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Ceph Storage 9 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references
Red Hat Red Hat OpenShift Container Platform 5 see references
Red Hat Red Hat OpenStack Platform 13 (Queens) see references
Red Hat Red Hat OpenStack Platform 18.0 see references

Weakness: CWE-672 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References