Cross-guest stack disclosure via unchecked DM_OP buffers
Published Jul 28, 2026 · Updated Jul 28, 2026
Improper initialization in Xen 4.10 and later allows guest OS users controlling an HVM device model to read Xen stack data. The DM_OP handler trusts the operation's declared buffer count, leaving operation structures uninitialized when too few buffers are supplied and returning residual stack contents. Exploitation requires control of an HVM guest device model in a stub domain or de-privileged Dom0, and the disclosed data can expose information from other guest contexts.
Summary
What happened
Improper initialization in Xen 4.10 and later allows guest OS users controlling an HVM device model to read Xen stack data. The DM_OP handler trusts the operation's declared buffer count, leaving operation structures uninitialized when too few buffers are supplied and returning residual stack contents. Exploitation requires control of an HVM guest device model in a stub domain or de-privileged Dom0, and the disclosed data can expose information from other guest contexts.
The record
- CVE
- CVE-2026-62433
- Published
- Jul 28, 2026
- Updated
- Jul 28, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-665, T1005
- 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?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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