KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails
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EPSS probability
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Published
8 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
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Evidence confidence
%55
Short explanation
A vulnerability has been resolved in the Linux kernel KVM x86 subsystem regarding the failure to re-pend GET_NESTED_STATE_PAGES if getting nested state pages fails.
If getting nested pages fails in the KVM_RUN path and userspace re-runs the vCPU, stale and unpinned PFNs could be mapped into components such as the vAPIC page.
What should be done?
- Follow vendor advisories
Chain of evidence and sources
Linux çekirdeği KVM x86 alt sisteminde GET_NESTED_STATE_PAGES isteğinin yeniden kuyruğa eklenmesi sorunu giderilmiştir.
Yama durumu için resmi kaynaklarda kesin bir durum doğrulanamamıştır.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails Re-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the nested pages fails in the KVM_RUN path. If userspace re-runs the vCPU, and vmcs02 holds valid PFNs from the *previous* run of L2, then KVM could re-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page. Note, both SVM and VMX (as of commit 11722439fb20 ("KVM: nVMX: Ensure KVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit") ensure the request is cleared on VM-Exit (including the "forced" case), i.e. there is no risk of double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request trying to map the nested pages.
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-2026-98863 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-2026-98863 weaknesses.
Official Sources and Advisories
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