CVE-2025-37885

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

State: Published
Severity: 8.8 High
Published: May 9, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	efc644048ecde54f016011fe10110addd0de348f to before e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769Affected efc644048ecde54f016011fe10110addd0de348f to before 116c7d35b8f72eac383b9fd371d7c1a8ffc2968bAffected efc644048ecde54f016011fe10110addd0de348f to before 023816bd5fa46fab94d1e7917fe131b79ed1fb41Affected efc644048ecde54f016011fe10110addd0de348f to before 3481fd96d801715942b6f69fe251133128156f30Affected efc644048ecde54f016011fe10110addd0de348f to before b5de7ac74f69603ad803c524b840bffd36368fc3Affected efc644048ecde54f016011fe10110addd0de348f to before 3066ec21d1a33896125747f68638725f456308dbAffected efc644048ecde54f016011fe10110addd0de348f to before 9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2Affected
LinuxLinux	4.4Affected before 4.4Not affected 5.10.237 through 5.10.Not affected 5.15.181 through 5.15.Not affected 6.1.136 through 6.1.Not affected 6.6.89 through 6.6.Not affected 6.12.26 through 6.12.Not affected 6.14.5 through 6.14.Not affected 6.15 and laterNot affected

Product

Versions

LinuxLinux

efc644048ecde54f016011fe10110addd0de348f to before e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769Affected
efc644048ecde54f016011fe10110addd0de348f to before 116c7d35b8f72eac383b9fd371d7c1a8ffc2968bAffected
efc644048ecde54f016011fe10110addd0de348f to before 023816bd5fa46fab94d1e7917fe131b79ed1fb41Affected
efc644048ecde54f016011fe10110addd0de348f to before 3481fd96d801715942b6f69fe251133128156f30Affected
efc644048ecde54f016011fe10110addd0de348f to before b5de7ac74f69603ad803c524b840bffd36368fc3Affected
efc644048ecde54f016011fe10110addd0de348f to before 3066ec21d1a33896125747f68638725f456308dbAffected
efc644048ecde54f016011fe10110addd0de348f to before 9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2Affected

LinuxLinux

4.4Affected
before 4.4Not affected
5.10.237 through 5.10.*Not affected
5.15.181 through 5.15.*Not affected
6.1.136 through 6.1.*Not affected
6.6.89 through 6.6.*Not affected
6.12.26 through 6.12.*Not affected
6.14.5 through 6.14.*Not affected
6.15 and laterNot affected

References

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