CVE-2026-43096

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/02226839079ccc558820a3b25c4c46812927b4ba
• https://git.kernel.org/stable/c/16cbec24897624051b324aa3a85859c38ca65fde

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