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.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00101.

Exploitation none

Automatable no

Technical Impact partial

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 Fast Datapath for RHEL 10 affected —
Red Hat Fast Datapath for RHEL 10 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 8 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Fast Datapath for RHEL 9 affected —
Red Hat Red Hat Enterprise Linux 10 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 4 affected —
Red Hat Red Hat OpenStack Platform 13 (Queens) affected —

No data.

No data.

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No data.

Project Subscriptions

Vendors Products
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Openshift Subscribe
Openstack Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No runtime mitigation. QEMU indirect_desc=off does not help: libvhost honours VRING_DESC_F_INDIRECT anyway. Do not expose vhost-user to untrusted guests.

References
Link Providers
https://access.redhat.com/security/cve/CVE-2026-93683 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2537015 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-93683 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-93683 cve-icon
History

Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

threat_severity

Moderate

Wed, 14 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
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.
Title Dpdk: dpdk: guest-triggered out-of-bounds walk via vhost indirect descriptor length toctou
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Redhat openstack
Weaknesses CWE-367
CPEs cpe:/a:redhat:openshift:4
cpe:/a:redhat:openstack:13
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:10::fastdatapath
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:8::fastdatapath
cpe:/o:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9::fastdatapath
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
Redhat openstack
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-14T17:43:42.202Z

Reserved: 2026-09-18T14:22:36.511Z

Link: CVE-2026-93683

cve-icon Vulnrichment

Updated: 2026-10-14T17:43:29.232Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T16:17:57.227

Modified: 2026-10-14T20:13:37.910

Link: CVE-2026-93683

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-14T15:03:08Z

Links: CVE-2026-93683 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-14T22:00:09Z

Weaknesses