KVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state
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EPSS probability
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Risk score
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Published
10 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Evidence confidence
%63
Short explanation
A vulnerability has been resolved in the Linux kernel within the KVM SEV component due to incorrect sequencing of cache maintenance operations during intra-host migration. This condition creates a race window that can lead to data corruption during memory reclaim.
It compromises data integrity by allowing old dirty ciphertext to be written over a new page owner's data during memory reuse and concurrent operations.
What should be done?
- Follow the vendor advisory for kernel updates
- Apply applicable patches provided by the maintainers
Chain of evidence and sources
Önbellek bakımı SEV durumu temizlenmeden önce yapılmalıdır.
Sıralama hatası, bellek geri kazanımı sırasında verilerin üzerine yazılmasına neden olabilir.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state Explicitly flush caches after intra-host migration before clearing "SEV active" on the source VM, as doing cache maintenance afterwards creates a tiny window where memory reclaim could return memory to the host without performing a cache flush, e.g. as pointed out by Sashiko: CPU1 in sev_migrate_from(): src->active = false; CPU2 running concurrent unmap: Since active is false, the automatic cache flush in sev_guest_memory_reclaimed is skipped. The host frees and reallocates the page. CPU1 in sev_migrate_from(): sev_writeback_caches(src_kvm); Executes a hardware cache flush (wbnoinvd), which writes the guest's old dirty ciphertext over the new page owner's data.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
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Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98718 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98718 weaknesses.
Official Sources and Advisories
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