varstored is a component of the Xapi toolstack handling UEFI Variables
for a VM. It has a communication path with OVMF inside the VM involving
mapping a buffer prepared by OVMF.
Within varstored, there were insufficient compiler barriers, creating
TOCTOU issues with data in the shared buffer.
The exact vulnerable behaviour depends on the code generated by the
compiler. In a build of varstored using default settings, the attacker
can control an index used in a jump table.
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://xenbits.xen.org/xsa/advisory-478.html |
|
History
Thu, 09 Jul 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Thu, 09 Jul 2026 15:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | varstored is a component of the Xapi toolstack handling UEFI Variables for a VM. It has a communication path with OVMF inside the VM involving mapping a buffer prepared by OVMF. Within varstored, there were insufficient compiler barriers, creating TOCTOU issues with data in the shared buffer. The exact vulnerable behaviour depends on the code generated by the compiler. In a build of varstored using default settings, the attacker can control an index used in a jump table. | |
| Title | varstored: TOCTOU issues with mapped guest memory | |
| Weaknesses | CWE-367 | |
| References |
| |
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: XEN
Published:
Updated: 2026-07-09T15:41:25.431Z
Reserved: 2025-08-26T06:48:41.444Z
Link: CVE-2025-58151
Updated: 2026-07-09T15:05:08.753Z
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OpenCVE Enrichment
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