CVE-2026-102703 arbitrary read/write via grant copy

Description

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] A common access pattern is a batch of Grant Copy operations acting on adjacent address ranges in the same source or destination page. For performance reasons, Xen caches details internally to reuse already validated data. The conditions on when to re-validate the internal data were not correct in some cases: - Frame numbers and grant references could wrongly be mixed up. This is CVE-2026-102703. - Copying by frame number (rather than grant reference) is permitted only when operating on the caller's own memory. The check to enforce this restriction was misplaced. This is CVE-2026-102704.

Exploitable avec un accès local à la machine, avec un compte ordinaire et sans action d’un utilisateur ; l’impact sur les données ou le service reste limité.

Vecteur d’attaque

Local

Complexité

Faible

Privilèges requis

Faibles

Interaction

Aucune

Portée

Inchangée

Confidentialité

Faible

Intégrité

Faible

Disponibilité

Aucun

Produits et versions touchés