KVM: arm64: Do not clear VM-wide SVE feature on vCPU init failure
CVSS score
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EPSS probability
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Risk score
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Published
15 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
CVE-2026-98637 is a bug in the Linux kernel KVM arm64 SVE handling; when vCPU initialization fails the VM‑wide SVE flag is not cleared, later vCPUs register with a NULL sve_state and the first FP access triggers an error.
This can cause the guest operating system to crash or become unavailable.
What should be done?
- Monitor the vendor advisory
- Since patch status is UNKNOWN, apply kernel updates when an official fix is released
- Disable SVE on affected kernel versions if possible
- Watch security logs for anomalies
Chain of evidence and sources
CVE-2026-98637, KVM arm64’de vCPU başlatma hatası sonrası SVE bayrağının temizlenmemesi nedeniyle NULL sve_state kaydedilmesine yol açan bir hatadır (S0, S1).
CVE‑2026‑98637 için aktif istismar kanıtı bulunmamaktadır; CISA KEV listesinde yer almamaktadır (S0).
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Do not clear VM-wide SVE feature on vCPU init failure pkvm_vcpu_init_sve() clears KVM_ARM_VCPU_SVE in kvm->arch.vcpu_features when it fails, but vcpu_has_sve() tests KVM_ARCH_FLAG_GUEST_HAS_SVE, which is left set. Later vCPUs on that VM then skip the SVE setup and register with a NULL sve_state, which the guest's first FP access hands to sve_load_state(). Return the error without touching vcpu_features.
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 |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
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-2026-98637 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-2026-98637 weaknesses.
Official Sources and Advisories
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