---
id: CVE-2025-37885
title: |-
  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 p…
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 p…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.4, < 5.10.237'
  - 'linux_kernel >= 5.11, < 5.15.181'
  - 'linux_kernel >= 5.16, < 6.1.136'
  - 'linux_kernel >= 6.2, < 6.6.89'
  - 'linux_kernel >= 6.7, < 6.12.26'
  - 'linux_kernel >= 6.13, < 6.14.5'
  - linux_kernel = 6.15
  - debian_linux = 11.0
patched:
  - linux_kernel 6.14.5
published: '2025-05-09'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:20.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-37885'
references:
  - url: 'https://git.kernel.org/stable/c/023816bd5fa46fab94d1e7917fe131b79ed1fb41'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/116c7d35b8f72eac383b9fd371d7c1a8ffc2968b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3066ec21d1a33896125747f68638725f456308db'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3481fd96d801715942b6f69fe251133128156f30'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9bcac97dc42d2f4da8229d18feb0fe2b1ce523a2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b5de7ac74f69603ad803c524b840bffd36368fc3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e5f2dee9f7fcd2ff4b97869f3c66a0d89c167769'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
epss: 0.00316
epssPercentile: 0.24379
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:45:46.467079Z'
ingestedAt: '2026-10-15T22:48:25.482Z'
---

## Overview

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.

## Affected

- `linux_kernel >= 4.4, < 5.10.237`
- `linux_kernel >= 5.11, < 5.15.181`
- `linux_kernel >= 5.16, < 6.1.136`
- `linux_kernel >= 6.2, < 6.6.89`
- `linux_kernel >= 6.7, < 6.12.26`
- `linux_kernel >= 6.13, < 6.14.5`
- `linux_kernel = 6.15`
- `debian_linux = 11.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.14.5`