Host memory disclosure via uninitialized uefi-vars buffer
Published Feb 18, 2026 · Updated Feb 18, 2026
Information disclosure in QEMU 10.0.0 and later, before 10.1.0, allows guest OS users to read residual host memory via uefi-vars. The uefi_vars_write callback allocates a guest-sized transfer buffer without zeroing it, and uefi_vars_read later returns untouched bytes through UEFI_VARS_REG_PIO_BUFFER_TRANSFER. Access requires a guest with the uefi-vars virtual device; the reported consequence is host-process memory disclosure without data modification or service interruption.
Summary
What happened
Information disclosure in QEMU 10.0.0 and later, before 10.1.0, allows guest OS users to read residual host memory via uefi-vars. The uefi_vars_write callback allocates a guest-sized transfer buffer without zeroing it, and uefi_vars_read later returns untouched bytes through UEFI_VARS_REG_PIO_BUFFER_TRANSFER. Access requires a guest with the uefi-vars virtual device; the reported consequence is host-process memory disclosure without data modification or service interruption.
The record
- CVE
- CVE-2025-8860
- Published
- Feb 18, 2026
- Updated
- Feb 18, 2026
- Vendor
- QEMU Project
- Product
- QEMU
- Classifications
- CWE-212, T1005
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Feb 18, 2026CVE publishedPublication date reported by the CVE source.
- Feb 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.0 <10.1.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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