CVE-2026-102703 (GCVE-0-2026-102703)

Vulnerability from cvelistv5 – Published: 2026-11-04 10:30 – Updated: 2026-11-04 18:24
VLAI
Title
arbitrary read/write via grant copy
Summary
[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.
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-04 18:24 UTC
CWE
  • CWE-704 - Incorrect Type Conversion or Cast
Assigner
XEN CNA under the mitre root
CNA scorecard D 56/100 over 48 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Xen Xen Unknown: consult Xen advisory XSA-523
guessed Create a notification for this product.
Date Public
2026-11-03 12:00
Credits
This issue was discovered by Anthropic using Claude, then validated by Stephan Lipp of Ada Logics. It was then independently reported by the CodeAnt AI Security Research Team.
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}



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