CVE-2025-37885

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products we track (2)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/023816bd5fa46fab94d1e7917fe131b79ed1fb41 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/023816bd5fa46fab94d1e7917fe131b79ed1fb41Patch
• https://git.kernel.org/stable/c/116c7d35b8f72eac383b9fd371d7c1a8ffc2968bPatch
• https://git.kernel.org/stable/c/3066ec21d1a33896125747f68638725f456308dbPatch
• https://git.kernel.org/stable/c/3481fd96d801715942b6f69fe251133128156f30Patch
• https://git.kernel.org/stable/c/9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2Patch
• https://git.kernel.org/stable/c/b5de7ac74f69603ad803c524b840bffd36368fc3Patch
• https://git.kernel.org/stable/c/e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769Patch
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlAdvisory