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.
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Advisories
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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
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 |
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| 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 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat openshift Redhat openstack |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-10-14T17:43:42.202Z
Reserved: 2026-09-18T14:22:36.511Z
Link: CVE-2026-93683
No data.
Status : Received
Published: 2026-10-14T16:17:57.227
Modified: 2026-10-14T18:19:35.960
Link: CVE-2026-93683
No data.
OpenCVE Enrichment
No data.
Weaknesses