CVE-2026-102703 Affecting xen package, versions <4.17.7+13-g2445b30a44-0+deb12u1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.14% (4th percentile)

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  • Snyk IDSNYK-ECHOLATEST-XEN-22193497
  • published4 Nov 2026
  • disclosed4 Nov 2026

Introduced: 4 Nov 2026

NewCVE-2026-102703  (opens in a new tab)

How to fix?

Upgrade Echo:latest xen to version 4.17.7+13-g2445b30a44-0+deb12u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

[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.

CVSS Base Scores

version 3.1