The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade Echo:latest xen to version 4.17.7+13-g2445b30a44-0+deb12u1 or higher.
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.