CVE-2025-37885
KVM: x86: Reset IRTE to host control if *new* route isn't postable
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KVM: x86: Reset IRTE to host control if *new* route isn't postable
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.
Reserved 2025-04-16 | Published 2025-05-09 | Updated 2025-05-09 | Assigner Linuxgit.kernel.org/...c/e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769
git.kernel.org/...c/116c7d35b8f72eac383b9fd371d7c1a8ffc2968b
git.kernel.org/...c/023816bd5fa46fab94d1e7917fe131b79ed1fb41
git.kernel.org/...c/3481fd96d801715942b6f69fe251133128156f30
git.kernel.org/...c/b5de7ac74f69603ad803c524b840bffd36368fc3
git.kernel.org/...c/3066ec21d1a33896125747f68638725f456308db
git.kernel.org/...c/9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2
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