CVE-2026-43096

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

mshv: Fix infinite fault loop on permission-denied GPA intercepts

Prevent infinite fault loops when guests access memory regions without

proper permissions. Currently, mshv_handle_gpa_intercept() attempts to

remap pages for all faults on movable memory regions, regardless of

whether the access type is permitted. When a guest writes to a read-only

region, the remap succeeds but the region remains read-only, causing

immediate re-fault and spinning the vCPU indefinitely.

Validate intercept access type against region permissions before

attempting remaps. Reject writes to non-writable regions and executes to

non-executable regions early, returning false to let the VMM handle the

intercept appropriately.

This also closes a potential DoS vector where malicious guests could

intentionally trigger these fault loops to consume host resources.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References