Xen Hypervisor CVE-2025-10263 XSA-493

MEDIUM

N/A vendor:alpine

Information Disclosure

Lifecycle Timeline

Analysis Generated

Jun 09, 2026 - 16:02 vuln.today

DescriptionCVE.org

Alpine Linux: xen fixed in 4.21.1-r6

AnalysisAI

Xen Hypervisor on Alpine Linux contains a security vulnerability addressed under Xen Security Advisory XSA-493, patched in Alpine package version 4.21.1-r6. The underlying vulnerability class, impact, and affected Xen upstream versions are not disclosed in the available intelligence - only the Alpine-specific fix version is confirmed. No active exploitation (KEV) or public exploit code has been identified at time of analysis.

Technical ContextAI

Xen is a Type-1 (bare-metal) hypervisor used extensively in cloud and virtualization infrastructure. XSA-493 is a Xen Project Security Advisory, a tracked series issued by the Xen Security Team for vulnerabilities in the hypervisor itself or its toolstack. Alpine Linux packages Xen and issues its own versioned patch (4.21.1-r6) that incorporates upstream XSA patches. Without the full XSA-493 advisory text, the specific CWE root cause class, affected subsystem (e.g., QEMU device emulation, PV guest interface, grant tables, memory management), and vulnerable Xen upstream version range cannot be determined from available data. No CPE strings or CWE identifier were provided.

Affected ProductsAI

Alpine Linux's Xen package is confirmed affected, with the fix available in Alpine package version 4.21.1-r6 (source: Alpine Linux vendor advisory). The specific upstream Xen version range affected by XSA-493 is not derivable from the provided data - refer to the Xen Project XSA-493 advisory at https://xenbits.xen.org/xsa/advisory-493.html for upstream version impact. Other Linux distributions packaging Xen may be independently affected and should be assessed against their respective vendor advisories.

RemediationAI

Update the Xen package on Alpine Linux to version 4.21.1-r6 or later using the Alpine package manager: 'apk upgrade xen'. This is the vendor-confirmed fix (source: Alpine Linux). For the upstream Xen fix and patches applicable to other distributions, consult the Xen Project XSA-493 advisory. If immediate patching is not feasible and the vulnerability affects guest-to-host or cross-guest attack surfaces, consider restricting untrusted guest workloads or isolating sensitive VMs to separate physical hosts as a compensating control - note this increases operational overhead and does not eliminate the vulnerability. Specific workarounds cannot be recommended without knowing the affected Xen subsystem from the full advisory.