CVE-2026-89329

Device-mapper-multipath: local denial of service via blocking ipc send operations

Published Sep 11, 2026 CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed

Description

A flaw was found in `multipathd`. A local attacker with access to the `multipathd` UNIX control socket can exploit this vulnerability by sending valid commands and then ceasing to read replies. This action can cause the `multipathd` listener thread to block, leading to a Denial of Service (DoS) where legitimate Inter-Process Communication (IPC) operations may hang or time out. This issue does not result in privilege escalation, arbitrary code execution, or impact data confidentiality or integrity.

Analysis

Technical impact

The vulnerability resides in the multipathd daemon used by device‑mapper‑multipath. A local attacker who can reach the Unix control socket may issue valid commands and then stop reading the replies. This forces the multipathd listener thread to block, causing legitimate inter-process communication to hang or time out. The flaw does not lead to privilege escalation, arbitrary code execution, or compromise of data confidentiality or integrity, but leads to a local denial of service.

Affected Systems

Affected systems include Red Hat Enterprise Linux 6 through 10 and Red Hat OpenShift Container Platform 4, where the multipathd IPC socket is world‑writable and thus exploitable by any local user who has permission to connect to the socket.

Risk and Exploitability

The CVSS score of 6.2 indicates moderate severity. An EPSS score of less than 1 % suggests a very low likelihood of exploitation in the wild, and the vulnerability is not listed in the CISA KEV catalog. However any user with access to the multipathd control socket on an affected system can trigger the denial of service, making the risk significant for those environments.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor	Product	Default status	Versions
Red Hat	Red Hat Enterprise Linux 10	affected	—
Red Hat	Red Hat Enterprise Linux 6	unknown	—
Red Hat	Red Hat Enterprise Linux 7	affected	—
Red Hat	Red Hat Enterprise Linux 8	affected	—
Red Hat	Red Hat Enterprise Linux 9	affected	—
Red Hat	Red Hat OpenShift Container Platform 4	affected	—
Red Hat	Red Hat OpenShift Container Platform 4	affected	—
Red Hat	Red Hat OpenShift Container Platform 5	affected	—

No data.

Vendor Product Versions

Redhat

Enterprise Linux

Version	Status	Scheme	Platform
`—`	affected	—	—

Redhat

Openshift Container Platform

Version	Status	Scheme	Platform
`—`	affected	—	—

Remediation

Vendor Workaround

To mitigate this issue, implement strict local access controls on systems running `multipathd`. This limits the ability of unprivileged users to interact with the `multipathd` IPC socket, thereby preventing exploitation of the world-writable control socket. Ensure that only trusted administrators have local access to the system.

OpenCVE Recommended Actions

Restrict access to the multipathd IPC socket to trusted administrators by removing world‑writable permissions, effectively implementing the provided workaround.
If device‑mapper‑multipath functionality is not required, disable the multipathd service to reduce the attack surface.
Audit local user accounts to ensure only privileged control socket, enforcing appropriate filesystem permissions or SELinux rules.

Generated by OpenCVE AI on September 21, 2026 at 04:07 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.164% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://access.redhat.com/security/cve/CVE-2026-89329
https://bugzilla.redhat.com/show_bug.cgi?id=2470013
https://nvd.nist.gov/vuln/detail/CVE-2026-89329
https://www.cve.org/CVERecord?id=CVE-2026-89329

History

Nov 6, 2026 1:30 AM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat rhel Els
CPEs	cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9	cpe:/a:redhat:enterprise_linux:10 cpe:/a:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:9 cpe:/a:redhat:openshift:5 cpe:/o:redhat:rhel_els:6 cpe:/o:redhat:rhel_els:7
Vendors & Products		Redhat rhel Els

Sep 13, 2026 8:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat openshift Container Platform
Vendors & Products		Redhat openshift Container Platform

Sep 12, 2026 12:15 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-89329 https://www.cve.org/CVERecord?id=CVE-2026-89329
Metrics	threat_severity `None`	threat_severity `Moderate`

Sep 11, 2026 11:45 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A flaw was found in `multipathd`. A local attacker with access to the `multipathd` UNIX control socket can exploit this vulnerability by sending valid commands and then ceasing to read replies. This action can cause the `multipathd` listener thread to block, leading to a Denial of Service (DoS) where legitimate Inter-Process Communication (IPC) operations may hang or time out. This issue does not result in privilege escalation, arbitrary code execution, or impact data confidentiality or integrity.
Title		Device-mapper-multipath: local denial of service via blocking ipc send operations
First Time appeared		Redhat Redhat enterprise Linux Redhat openshift
Weaknesses		CWE-1322
CPEs		cpe:/a:redhat:openshift:4 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9
Vendors & Products		Redhat Redhat enterprise Linux Redhat openshift
References		https://access.redhat.com/security/cve/CVE-2026-89329 https://bugzilla.redhat.com/show_bug.cgi?id=2470013
Metrics		cvssV3_1 `{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`