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CVE-2026-98863— KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails

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：x86：若获取嵌套状态页失败，则重新挂起 GET_NESTED_STATE_PAGES 请求 在 KVM_RUN 路径中，如果获取嵌套页失败，则在退出到用户空间之前，应重新挂起 GET_NESTED_STATE_PAGES 请求。否则，若用户空间再次运行 vCPU，而 vmcs02 中仍保留来自 L2 上一次运行时的有效页框号（PFN），KVM 可能会使用已失效且未固定的 PFN 重新进入 L2，例如将过时的 PFN 映射到虚拟 APIC（vAPIC）页面中，从

AI Predicted 8.8 Difficulty: Hard

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 671ddc700fd08b94967b1e2a937020e30c838609< 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 affected
671ddc700fd08b94967b1e2a937020e30c838609< 942192dbcd3a06695ef6b31cf10a41a21cf014d8 affected
671ddc700fd08b94967b1e2a937020e30c838609< 10180a277549339020b08000206092c07e0bff5a affected
5.4 affected
< 5.4 unaffected
6.18.56≤ 6.18.* unaffected
7.2.10≤ 7.2.* unaffected
7.3-rc5≤ * unaffected
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I. Basic Information for CVE-2026-98863

Vulnerability Information
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Vulnerability Title
KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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 671ddc700fd08b94967b1e2a937020e30c838609 ~ 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-98863

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III. Intelligence Information for CVE-2026-98863

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Patches & Fixes for CVE-2026-98863 (3)

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-2026-98732 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-2026-98720 KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
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-2026-98863

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