VulnerabilityPublished 29 Oct 2026

CVE-2026-93006: Red Hat Ceph Storage 9 · Operation on a Resource after Expiration or Release

Affects Red Hat Ceph Storage 9Source CVE Database V5

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Not known to be exploited · CVSS 6.8 Medium.

Data as of 29 Oct 2026, 14:52 UTC

CVSS 3.1 base score

6.8Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (redhat)	CVSS 3.1	6.8

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

Attack Vector: Adjacent
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Adjacent: The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hat Ceph Storage 9rhceph/alloy-rhel10	Affected–	Fixed in–
Red Hat Enterprise Linux 10dnsmasq	Affected–	Fixed in–
Red Hat Enterprise Linux 6dnsmasq	Affected–	Fixed in–
Red Hat Enterprise Linux 7dnsmasq	Affected–	Fixed in–
Red Hat Enterprise Linux 8dnsmasq	Affected–	Fixed in–
Red Hat Enterprise Linux 9dnsmasq	Affected–	Fixed in–

AI-suggested

Red Hat recommends the following mitigations: 1) Disable TFTP if it is not required by removing the --enable-tftp option from dnsmasq configuration. 2) If TFTP is necessary, restrict its use with the --tftp-interface option to limit exposure and avoid running TFTP-only instances serving untrusted clients on the same network. 3) Compile dnsmasq without TFTP support using COPTS=-DNO_TFTP if TFTP functionality is not needed. These mitigations reduce the risk of exploitation.

Description

A vulnerability in dnsmasq's TFTP server can cause it to serve incorrect file contents due to a stale transfer cache not being invalidated after a transfer completes. This flaw allows an attacker on the local network to cause a victim client to receive previously cached data instead of the requested file. In PXE network-boot environments, this can lead to attacker-chosen boot content being substituted for the victim machine's legitimate boot files.

Impact

An attacker on the local network can cause a victim client to receive incorrect TFTP file contents by exploiting the stale transfer cache. This can lead to substitution of attacker-chosen boot content in PXE network-boot environments, resulting in high confidentiality and integrity impact. The attack requires adjacency to the network and has high complexity, limiting the ease of exploitation. There is no impact on availability.

Summary

CVE-2026-93006 is a vulnerability in dnsmasq affecting the TFTP server component. The issue arises because the transfer cache used by the TFTP server is not invalidated when a transfer finishes, causing subsequent clients to potentially receive stale, attacker-controlled data. This flaw is exploitable by an attacker on the adjacent network who can request TFTP files, particularly impacting PXE network-boot environments where boot content substitution can compromise system integrity and confidentiality. The attack complexity is high due to requirements such as DNS forwarding manipulation and heap reuse. The vulnerability affects dnsmasq versions 2.92 or newer with TFTP enabled at runtime; Red Hat's current dnsmasq packages ship version 2.90 or earlier and do not contain the vulnerable TFTP prefetch cache. The vulnerability is rated with a CVSS 3.1 score of 6.8 by Red Hat, reflecting high confidentiality and integrity impact but no availability impact.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Oct 2026, 13:05 UTC

Technical details

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