Bug 2554835 (CVE-2026-98466) - CVE-2026-98466 kernel: KVM: arm64: Transfer the hyp stack pages out of the host stage-2
Summary: CVE-2026-98466 kernel: KVM: arm64: Transfer the hyp stack pages out of the ho...
Keywords:
Status: NEW
Alias: CVE-2026-98466
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-18 15:21 UTC by OSIDB Bzimport
Modified: 2026-10-19 18:00 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-18 15:21:54 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-10-19 17:50:03 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98466.mbox
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