CVE-2026-98720KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified Force a refresh of the vmcs02 MSR bitmap during nested VM-Enter if the runtime eVMCS controls (pin, primary, secondary, etc.) are being updated. If L1 isn't intercepting TPR writes, runs L2 with TPR virtualization, and then runs the same L2 with TPR virtualization disabled, KVM will fail to refresh msr_bitmap02 and leave TPR in passthrough mode even though TPR virtualization is disabled. I.e. failure to refresh the bitmap lets L2 (or L1 by proxy) read and write L0's TPR.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e builds before 2db11598b59f16ddb6420693f9a4ac4efc3d4789; from 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e before f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a; 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e builds before 1e497e3bdab6983deb68a1d26b488027deb4527f; 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e builds before 2abb25273c82061dd4670690c81c319c03740bf6 | CNA record |
References
- https://git.kernel.org/stable/c/2db11598b59f16ddb6420693f9a4ac4efc3d4789
- https://git.kernel.org/stable/c/f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a
- https://git.kernel.org/stable/c/1e497e3bdab6983deb68a1d26b488027deb4527f
- https://git.kernel.org/stable/c/2abb25273c82061dd4670690c81c319c03740bf6
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.