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CVE-2026-98720— KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： KVM：nVMX：若运行时 eVMCS 控制项被修改，则强制刷新 MSR 位图 在嵌套 VM-Enter 过程中，如果运行时的 eVMCS 控制项（如引脚控制、一级控制、二级控制等）正在被更新，则强制刷新 vmcs02 的 MSR 位图。若 L1 未拦截 TPR 写入操作，先以启用 TPR 虚拟化的方式运行 L2，随后又以禁用 TPR 虚拟化的方式运行同一 L2，则 KVM 将无法刷新 msr_bitmap02，导致 TPR 仍处于直通模式，尽管此时 TPR 虚拟化已被

AI Predicted 8.8 Difficulty: Moderate EPSS 0.17% · P6

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e< 2db11598b59f16ddb6420693f9a4ac4efc3d4789 affected
502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e< f6189e26d0237e47e2f04f9cb1e43fd19a9b2f3a affected
502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e< 1e497e3bdab6983deb68a1d26b488027deb4527f affected
502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e< 2abb25273c82061dd4670690c81c319c03740bf6 affected
5.17 affected
< 5.17 unaffected
6.12.113≤ 6.12.* unaffected
6.18.56≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98720

Vulnerability Information
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Vulnerability Title
KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 502d2bf5f2fd7c05adc2d4f057910bd5d4c4c63e ~ 2db11598b59f16ddb6420693f9a4ac4efc3d4789 -
Linux Linux 5.17 -

II. Public POCs for CVE-2026-98720

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III. Intelligence Information for CVE-2026-98720

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Patches & Fixes for CVE-2026-98720 (4)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98719 KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it
CVE-2026-98733 Bluetooth: hci_core: Serialize fragmented ISO packet queueing
CVE-2026-98732 Bluetooth: btintel: fix buffer over-read in btintel_hw_error()
CVE-2026-98731 Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame()
CVE-2026-98730 Bluetooth: btintel_pcie: reject oversized TX packets in send_frame()
CVE-2026-98729 x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h
CVE-2026-98728 tpm: fix off-by-four bounds check in tpm2_get_random()
CVE-2026-98727 nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known
CVE-2026-98726 nvme-multipath: fix underflow in ANA log bounds checks
CVE-2026-98725 nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()
CVE-2026-98724 nvmet: pci-epf: reject too-short SGL segments
CVE-2026-98723 nvmet: copy the hostid into the ctrl before creating PR pc_refs
CVE-2026-98722 mtd: block2mtd: Fix divide error when erase_size is zero
CVE-2026-98721 mtd: rawnand: cadence: Initialize IRQ state before requesting IRQ
CVE-2026-98707 wifi: mac80211: shut down RX BA session timer on teardown
CVE-2026-98711 wifi: cw1200: fix TX padding OOB read leaking heap data to device
CVE-2026-98710 wifi: iwlegacy: 3945: free EEPROM data on remove
CVE-2026-98709 wifi: mac80211: count only matching reservations in reserved switch
CVE-2026-98712 KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq
CVE-2026-98708 wifi: mac80211: keep paired old chanctx alive

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98720

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