CVE-2026-93683

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Heap Overflow in DPDK vhost Library

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: redhat-SADP

Description

A flaw was found in the DPDK vhost library. When handling a virtio indirect descriptor table, the host reads the table length more than once from guest memory and can allocate a host copy before validating that length. A guest that changes the length between those reads, or that supplies an out-of-range next index on a small host copy in the vDPA relay path, can cause the host vhost process to walk past the validated mapping or heap copy. That can crash or disrupt the vhost process. Out-of-bounds bytes are consumed as descriptor fields for GPA translation and are not returned to the guest as payload. This is a residual issue in the non-contiguous indirect descriptor copy path introduced as part of the CVE-2018-1059 fix.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-93683

EUVD

EUVD-2026-101306

Affected Vendors & Products

Vendor	Product	Version / Range
Red	Hat	Fast Datapath for RHEL 10 *
Red	Hat	Fast Datapath for RHEL 8 *
Red	Hat	Fast Datapath for RHEL 9 *
Red	Hat	Red Hat Enterprise Linux 10 *
Red	Hat	Red Hat Enterprise Linux 8 *
Red	Hat	Red Hat Enterprise Linux 9 *
Red	Hat	Red Hat OpenShift Container Platform 4 *
Red	Hat	Red Hat OpenStack Platform 13 (Queens) *

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-367	The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

Attack-Flow Graph

Executive Summary

This vulnerability is a time-of-check to time-of-use (TOCTOU) race condition in the DPDK vhost library. It occurs when handling virtio indirect descriptor tables. The host reads the table length multiple times from guest memory without proper validation. A malicious guest can change the length between these reads or provide an out-of-range index, causing the vhost process to access memory outside the validated mapping or heap copy. This can crash or disrupt the vhost process, leading to a denial of service.

Detection Guidance

Detecting this vulnerability requires monitoring for crashes or disruptions in the vhost process, particularly in DPDK-based environments. Check logs for vhost-user related errors or segmentation faults. Use system monitoring tools like 'dmesg' or 'journalctl' to identify crashes in the vhost process. No specific commands are provided in the context to directly detect this issue.

Impact Analysis

If exploited, this vulnerability can cause the vhost process to crash or become disrupted, resulting in a denial of service. It requires a compromised guest to manipulate the descriptor table length or index, so only environments with untrusted guests are at risk. The impact is limited to the vhost process and does not directly expose guest data.

Compliance Impact

This vulnerability primarily impacts system availability and integrity by allowing a malicious guest to crash or disrupt the vhost process, leading to potential denial of service. It does not directly expose or leak sensitive data, which is a key concern for GDPR and HIPAA compliance. However, prolonged disruption could indirectly affect compliance by impacting service availability for regulated workloads.

Mitigation Strategies

Avoid exposing vhost-user to untrusted guests. Update to the latest patched versions of DPDK and affected Red Hat products. Monitor for crashes in the vhost process and apply vendor patches as they become available. No runtime mitigation exists beyond these measures.

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