Guest-triggered hypervisor corruption via unbounded trace copy
Published Jan 28, 2026 · Updated Jan 28, 2026
Out-of-bounds write in Xen shadow tracing allows guest OS users to corrupt hypervisor memory through oversized page-table writes. The trace_emulate_write_val helper copies guest-controlled write bytes into a per-CPU variable sized for one PTE without limiting the copy length. Exploitation requires an x86 HVM guest using shadow paging while tracing is enabled; the corruption most likely falsifies trace data, while privilege escalation, disclosure, and service interruption remain build-dependent.
Summary
What happened
Out-of-bounds write in Xen shadow tracing allows guest OS users to corrupt hypervisor memory through oversized page-table writes. The trace_emulate_write_val helper copies guest-controlled write bytes into a per-CPU variable sized for one PTE without limiting the copy length. Exploitation requires an x86 HVM guest using shadow paging while tracing is enabled; the corruption most likely falsifies trace data, while privilege escalation, disclosure, and service interruption remain build-dependent.
The record
- CVE
- CVE-2025-58150
- Published
- Jan 28, 2026
- Updated
- Jan 28, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 28, 2026CVE publishedPublication date reported by the CVE source.
- Jan 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Published CVSS scores
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Attacks
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Technologies
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