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.

Classification

CVE ID: CVE-2025-37885

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 7.64% (scored less or equal to compared to others)

EPSS Date: 2025-06-07 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-37885
https://git.kernel.org/stable/c/e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769
https://git.kernel.org/stable/c/116c7d35b8f72eac383b9fd371d7c1a8ffc2968b
https://git.kernel.org/stable/c/023816bd5fa46fab94d1e7917fe131b79ed1fb41
https://git.kernel.org/stable/c/3481fd96d801715942b6f69fe251133128156f30
https://git.kernel.org/stable/c/b5de7ac74f69603ad803c524b840bffd36368fc3
https://git.kernel.org/stable/c/3066ec21d1a33896125747f68638725f456308db
https://git.kernel.org/stable/c/9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2

Timeline