Xen Data Confidentiality Vulnerability (xsa488, CVE-2025-54505)
Summary
CERT-FR issued a security advisory reporting a data confidentiality vulnerability in the Xen hypervisor (CVE-2025-54505). The flaw affects Xen versions 4.17.x through 4.21.x and xen-unstable. An attacker could exploit this vulnerability to compromise data confidentiality. Organizations running affected Xen versions are advised to obtain and apply the relevant patches from the Xen security bulletin xsa488.
“Une vulnérabilité a été découverte dans Xen. Elle permet à un attaquant de provoquer une atteinte à la confidentialité des données.”
Any organization running Xen hypervisors — particularly in cloud service, hosting, or enterprise virtualization environments — should treat this as an immediate patching priority. Unlike a recall with a defined response deadline, no compliance date is imposed by this advisory; however, the absence of a stated workaround means patching is the only remediation path. Teams maintaining Xen estates should verify patch availability for each active version branch and factor xsa488 into their next patch-cycle planning.
What changed
CERT-FR published a security advisory (CERTFR-2026-AVI-0460) disclosing a data confidentiality vulnerability in the Xen hypervisor tracked as CVE-2025-54505. The vulnerability affects Xen versions 4.17.x, 4.18.x, 4.19.x, 4.20.x, xen-unstable, and 4.21.x, with version-specific patches referenced in Xen security bulletin xsa488 dated 17 April 2026. The sole remediation is application of the vendor-supplied patches; no workaround is listed.
Organizations operating Xen-based virtualization or cloud infrastructure should audit their Xen deployments immediately, identify affected versions, and apply the corresponding patch from the Xen security advisory. Failure to patch leaves systems vulnerable to an attacker-induced data confidentiality breach.
What to do next
- Identify Xen versions in use and cross-reference against affected versions 4.17.x, 4.18.x, 4.19.x, 4.20.x, xen-unstable, and 4.21.x
- Apply the relevant vendor security patch (xsa488-4.17.patch, xsa488-4.18.patch, xsa488-4.20.patch, or xsa488.patch) per Xen security bulletin xsa488
Archived snapshot
Apr 20, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Premier Ministre S.G.D.S.N
Agence nationale
de la sécurité des
systèmes d'information
Paris, le 20 avril 2026 N° CERTFR-2026-AVI-0460 Affaire suivie par: CERT-FR
Avis du CERT-FR
Objet: Vulnérabilité dans Xen
Gestion du document
| Référence | CERTFR-2026-AVI-0460 |
| Titre | Vulnérabilité dans Xen |
| Date de la première version | 20 avril 2026 |
| Date de la dernière version | 20 avril 2026 |
| Source(s) | Bulletin de sécurité Xen xsa/advisory-488 du 17 avril 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.
Risque
- Atteinte à la confidentialité des données
Systèmes affectés
- Xen versions 4.17.x avec le correctif de sécurité xsa488-4.17.patch
- Xen versions 4.18.x avec le correctif de sécurité xsa488-4.18.patch
- Xen versions 4.19.x et 4.20.x sans le correctif de sécurité xsa488-4.20.patch
- Xen versions xen-unstable et 4.21.x sans le correctif de sécurité xsa488.patch
Résumé
Une vulnérabilité a été découverte dans Xen. Elle permet à un attaquant de provoquer une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Documentation
- Bulletin de sécurité Xen xsa/advisory-488 du 17 avril 2026
- https://xenbits.xen.org/xsa/advisory-488.html
- Référence CVE CVE-2025-54505
- https://www.cve.org/CVERecord?id=CVE-2025-54505
Gestion détaillée du document
- le 20 avril 2026 Version initiale
Related changes
Get daily alerts for CERT-FR Security Advisories
Daily digest delivered to your inbox.
Free. Unsubscribe anytime.
About this page
Every important government, regulator, and court update from around the world. One place. Real-time. Free. Our mission
Source document text, dates, docket IDs, and authority are extracted directly from CERT-FR.
The summary, classification, recommended actions, deadlines, and penalty information are AI-generated from the original text and may contain errors. Always verify against the source document.
Classification
Who this affects
Taxonomy
Browse Categories
Get alerts for this source
We'll email you when CERT-FR Security Advisories publishes new changes.
Subscribed!
Optional. Filters your digest to exactly the updates that matter to you.