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.
Published: 2026-10-14
Score: 6.4 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

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.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

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'}


Subscriptions

Redhat Enterprise Linux Openshift Openstack
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

No data.

cve-icon NVD

Status : Received

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

Modified: 2026-10-14T18:19:35.960

Link: CVE-2026-93683

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-367

    Time-of-check Time-of-use (TOCTOU) Race Condition