CVE-2025-37885 Information

Description

In the Linux kernel the following vulnerability has been resolved:

KVM: x86: Reset IRTE to host control if new route isn’t postable

Restore an IRTE back to host control (remapped or posted MSI mode) if the new GSI route prevents posting the IRQ directly to a vCPU regardless of the GSI routing type. Updating the IRTE if and only if the new GSI is an MSI results in KVM leaving an IRTE posting to a vCPU.

The dangling IRTE can result in interrupts being incorrectly delivered to the guest and in the worst case scenario can result in use-after-free e.g. if the VM is torn down but the underlying host IRQ isn’t freed.

Reference

https://git.kernel.org/stable/c/023816bd5fa46fab94d1e7917fe131b79ed1fb41 https://git.kernel.org/stable/c/116c7d35b8f72eac383b9fd371d7c1a8ffc2968b https://git.kernel.org/stable/c/3066ec21d1a33896125747f68638725f456308db https://git.kernel.org/stable/c/3481fd96d801715942b6f69fe251133128156f30 https://git.kernel.org/stable/c/9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2 https://git.kernel.org/stable/c/b5de7ac74f69603ad803c524b840bffd36368fc3 https://git.kernel.org/stable/c/e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769