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4.4 Medium

CVE-2026-102703 arbitrary read/write via grant copy

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.

CVSS 3.1 detail

Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitable with local access to the machine, with an ordinary account and without any user action; the impact on data or service is limited.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Affected products and versions

Product Affected versions Fixed in
xen Versions not published

Other CVEs of xen

The 142 CVEs of xen →
CVE-2026-102704 arbitrary read/write via grant copy 4.4 Medium CVE-2026-102700 With its original introduction, GNTTAB_cache_flush was made available uniformly 4.7 Medium CVE-2026-102702 [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to… 7.5 High CVE-2026-102699 [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to… 7.5 High
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