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

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.

Exploitable avec un accès local à la machine, avec un compte ordinaire et sans action d’un utilisateur ; un attaquant peut compromettre gravement la confidentialité, l’intégrité ou la disponibilité.

Vecteur d’attaque

Local

Complexité

Élevée

Privilèges requis

Faibles

Interaction

Aucune

Portée

Modifiée

Confidentialité

Faible

Intégrité

Aucun

Disponibilité

Élevé

Produits et versions touchés