Host panic via shared sub-page encryption buffer
Published Sep 4, 2026 · Updated Sep 4, 2026
Denial of service in Linux KVM 7.2 allows attackers to panic SNP-enabled hosts during SEV or SEV-ES memory operations. KVM allocates a temporary encryption buffer smaller than 4 KiB, then assigns its entire containing page to firmware while unrelated kernel code can still use another allocation on that page. Concurrent software access raises an RMP page-fault violation and can panic the host; no reliable unprivileged trigger has been published.
Summary
What happened
Denial of service in Linux KVM 7.2 allows attackers to panic SNP-enabled hosts during SEV or SEV-ES memory operations. KVM allocates a temporary encryption buffer smaller than 4 KiB, then assigns its entire containing page to firmware while unrelated kernel code can still use another allocation on that page. Concurrent software access raises an RMP page-fault violation and can panic the host; no reliable unprivileged trigger has been published.
The record
- CVE
- CVE-2026-80853
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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=4c735bf1bc22fd6ee66ab4bffe1d7599c3964781 <97f6402f5950ca3450541287c4b3664f3acda976
- Affected versionversion=4c735bf1bc22fd6ee66ab4bffe1d7599c3964781 <a33c40b93ccf5177e042253807d40e0b92e7f206
- Affected versionversion=7.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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