Guest-to-host escalation via mismatched grant-copy page
Published Jul 28, 2026 · Updated Jul 28, 2026
Type confusion in Xen 4.2 and later allows guest OS users to gain host privileges through concurrent grant-copy operations. When a grant is already pinned, the grant-table path can return inconsistent page data, so permission checks cover a different page from the copy. An unprivileged guest must race a mapping or another copy; successful exploitation can expose or alter host data or interrupt the host.
Summary
What happened
Type confusion in Xen 4.2 and later allows guest OS users to gain host privileges through concurrent grant-copy operations. When a grant is already pinned, the grant-table path can return inconsistent page data, so permission checks cover a different page from the copy. An unprivileged guest must race a mapping or another copy; successful exploitation can expose or alter host data or interrupt the host.
The record
- CVE
- CVE-2026-62428
- Published
- Jul 28, 2026
- Updated
- Jul 28, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-367, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 28, 2026CVE publishedPublication date reported by the CVE source.
- Jul 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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