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

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-18 · updated 2026-10-24

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.

Affected products

Linux kernel: 5.19 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/22df195bff84300a3f04813d6148765c77ac565a
https://git.kernel.org/stable/c/3a8c562892b96f35bba1e00d5e455a15963bbb92
https://git.kernel.org/stable/c/e5dd2a91a7ae3a276e6d79806127e923936e241b

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