CVE-2026-93683
Dpdk: dpdk: guest-triggered out-of-bounds walk via vhost indirect descriptor length toctou
At a glance
- Severity
- MEDIUM 6.4
- EPSS
- EPSS 0.10 % · percentile 1 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Awaiting Analysis
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.4 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:H | redhat |
| CVSS 3.1 | MEDIUM 6.4 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:H | NVD · secalert@redhat.com (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-101306
- GCVE · GCVE-0-2026-93683
Affected products
References
- https://access.redhat.com/security/cve/CVE-2026-93683
- https://bugzilla.redhat.com/show_bug.cgi?id=2537015
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |