High [CVE-2026-53200] Fix handling of XN[0] when !FEAT_XNX
This high-severity Red Hat Linux advisory covers CVE-2026-53200 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
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. A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) for ARM64 architectures.
This vulnerability arises from incorrect handling of the Execute Never (XN) bit, a memory protection feature, when the FEAT_XNX feature is not enabled. This error can lead to execute permissions being unconditionally granted, potentially allowing a local attacker to execute arbitrary code with elevated privileges.
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-266.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 9 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 9 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 9 days ago·verify at source
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