arbitrary read/write via grant copy

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102703
StatePUBLISHED
AssignerXEN
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 11:17:07 UTC
Updated2026-11-04 11:17:07 UTC
Description[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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xen Xen unknown consult Xen advisory XSA-523 Not specified

References

ReferenceSourceLinkTags
xenbits.xenproject.org/xsa/advisory-523.html [email protected] xenbits.xenproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: 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. (en)

Additional Advisory Data

Workarounds

CNA: There is no known mitigation.

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