Bug 2492799 (CVE-2026-53200) - CVE-2026-53200 kernel: KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
Summary: CVE-2026-53200 kernel: KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
Keywords:
Status: NEW
Alias: CVE-2026-53200
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-25 10:06 UTC by OSIDB Bzimport
Modified: 2026-06-26 00:52 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-06-25 10:06:22 UTC 
In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX

XN has already been extracted from its bitfield position so using
FIELD_PREP() on the mask that clears XN[0] is completely broken, having
the effect of unconditionally granting execute permissions...

Fix the obvious mistake by manipulating the right bit.
Comment 1 Keith Grant 2026-06-26 00:46:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062500-CVE-2026-53200-8066@gregkh/T
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