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CVE-2026-98466— KVM: arm64: Transfer the hyp stack pages out of the host stage-2

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，以下漏洞已被修复： KVM: arm64：将 Hyp 栈页从宿主机的 Stage-2 地址空间中移出。问题在于函数仅遍历每个内存块（memblock）区域的线性映射别名；而每个 CPU 的 Hyp 栈（其保护页映射在私有虚拟地址范围内）并不存在这样的线性映射别名，因此未被正确处理。修复方案：使用相同的遍历器（walker）对每个栈的虚拟地址范围进行遍历。

CVSS 8.2 · High EPSS 0.17% · P6 Updated Oct 24, 2026

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`1a919b17ef012ca0572bae759c27e5ea02bfb47f< e5dd2a91a7ae3a276e6d79806127e923936e241b`	affected
		`1a919b17ef012ca0572bae759c27e5ea02bfb47f< 22df195bff84300a3f04813d6148765c77ac565a`	affected
		`1a919b17ef012ca0572bae759c27e5ea02bfb47f< 3a8c562892b96f35bba1e00d5e455a15963bbb92`	affected
		`5.19`	affected
		`< 5.19`	unaffected
		`6.18.55≤ 6.18.*`	unaffected
		`7.2.9≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

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Vulnerability Information

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Vulnerability Title

KVM: arm64: Transfer the hyp stack pages out of the host stage-2

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Transfer the hyp stack pages out of the host stage-2 fix_host_ownership() walks only the linear-map alias of each memblock region, and the per-CPU hyp stack, mapped in the private VA range for its guard page, has none. Walk each stack's VA range with the same walker.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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	1a919b17ef012ca0572bae759c27e5ea02bfb47f ~ e5dd2a91a7ae3a276e6d79806127e923936e241b	-
Linux	Linux	5.19	-

II. Public POCs for CVE-2026-98466

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-98466

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Patches & Fixes for CVE-2026-98466 (2)

https://www.cve.org/CVERecord?id=CVE-2026-98466

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

CVE-2026-98490	9.8 CRITICAL	net: openvswitch: conntrack: fix helper UAF due to extensions realloc
CVE-2026-98548	9.8 CRITICAL	sctp: discard the rest of the packet on a stale-cookie error
CVE-2026-98464	9.3 CRITICAL	RISC-V: KVM: Synchronize hrtimer callback during teardown
CVE-2026-98549	9.1 CRITICAL	tcp: prevent collapsing skbs across boundary in rtx queue
CVE-2026-98451	8.8 HIGH	smb: client: use finish_no_open() for non-regular inodes
CVE-2026-98499	8.1 HIGH	HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
CVE-2026-98454	8.1 HIGH	smb: client: fix create context out-of-bounds reads
CVE-2026-98532	8.1 HIGH	ipv6: do not let ipv6_find_hdr() return an offset past the packet end
CVE-2026-98507	7.8 HIGH	mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish
CVE-2026-98487	7.8 HIGH	net: bridge: mdb: restart port group walk after deletion
CVE-2026-98520	7.8 HIGH	drm/amdkfd: fix use-after-free and multi-container gap in kfd_dev_mapping
CVE-2026-98517	7.8 HIGH	drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM
CVE-2026-98515	7.8 HIGH	drm/nouveau: fix double-free in nvif_vmm_dtor
CVE-2026-98491	7.8 HIGH	net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry
CVE-2026-98436	7.8 HIGH	accel/amdxdna: Disable device buffer exporting
CVE-2026-98510	7.8 HIGH	drm/xe/vm: nuke PTs only after unlinking contested VMAs
CVE-2026-98524	7.8 HIGH	rds: ib: Clear the sg list when mapping an MR fails
CVE-2026-98443	7.8 HIGH	xfs: fix cursor and pointer handling when recovering iunlink buckets
CVE-2026-98442	7.8 HIGH	net/sched: act_ct: fix helper UAF due to extensions realloc
CVE-2026-98441	7.8 HIGH	net/sched: act_ct: avoid modifying shared unconfirmed ct entry

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

IV. Related Vulnerabilities

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