CVE-2026-98863
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.
Affected versions
Linux kernel versions
5.4
and later are affected. Fixed in
6.18.56,
7.2.10,
7.3
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-98863?
CVE-2026-98863 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.4 onward and has been patched in 6.18.56, 7.2.10 and 7.3. CVE-2026-98863 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98863?
Yes. CVE-2026-98863 has been patched. Fixed versions include 6.18.56, 7.2.10 and 7.3. If you are running Linux kernel 5.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98863 actively exploited?
No. CVE-2026-98863 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.