---
id: CVE-2026-43130
title: >-
  iommu/vt-d: Flush dev-IOTLB only when PCIe device is accessible in scalable
  mode
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  iommu/vt-d: Flush dev-IOTLB only when PCIe device is accessible in scalable
  mode


  Commit 4fc82cd907ac ("iommu/vt-d: Don't issue ATS Invalidation

  request when device is …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f873b85ec762c5a6abe94a7ddb31df5d3ba07d85 <
    581ce094d9eafb78ec4f9de77bd24b780c151236
  - >-
    Linux >= d70f1c85113cd8c2aa8373f491ca5d1b22ec0554 <
    e2c78c69f8faf2885ea4ceee08c71ac738f401a0
  - >-
    Linux >= 34a7b30f56d30114bf4d436e4dc793afe326fbcf <
    ead67d0378e90f419e385a43af29435242d80c12
  - >-
    Linux >= 2b74b2a92e524d7c8dec8e02e95ecf18b667c062 <
    01aed2f1d7cb8fdf4c60c5bb4727608cb82b401d
  - >-
    Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b <
    9813306610d0d718c863aaa70928bf57d7570ec0
  - >-
    Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b <
    9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94
  - >-
    Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b <
    0da6697e577023d8867c7beb2d16a22510e4eea9
  - >-
    Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b <
    10e60d87813989e20eac1f3eda30b3bae461e7f9
  - Linux c04f2780919f20e2cc4846764221f5e802555868
  - Linux 025bc6b41e020aeb1e71f84ae3ffce945026de05
  - Linux >= 5.10.214 < 5.10.252
  - Linux >= 5.15.153 < 5.15.202
  - Linux >= 6.1.83 < 6.1.165
  - Linux >= 6.6.23 < 6.6.128
  - Linux >= 6.7.11 < 6.8
  - Linux >= 6.8.2 < 6.9
  - Linux 6.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:29:00.364045Z'
published: '2026-05-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:32:32.416Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43130'
references:
  - url: 'https://git.kernel.org/stable/c/581ce094d9eafb78ec4f9de77bd24b780c151236'
  - url: 'https://git.kernel.org/stable/c/e2c78c69f8faf2885ea4ceee08c71ac738f401a0'
  - url: 'https://git.kernel.org/stable/c/ead67d0378e90f419e385a43af29435242d80c12'
  - url: 'https://git.kernel.org/stable/c/01aed2f1d7cb8fdf4c60c5bb4727608cb82b401d'
  - url: 'https://git.kernel.org/stable/c/9813306610d0d718c863aaa70928bf57d7570ec0'
  - url: 'https://git.kernel.org/stable/c/9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94'
  - url: 'https://git.kernel.org/stable/c/0da6697e577023d8867c7beb2d16a22510e4eea9'
  - url: 'https://git.kernel.org/stable/c/10e60d87813989e20eac1f3eda30b3bae461e7f9'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02025
ingestedAt: '2026-11-06T15:54:04.018Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

iommu/vt-d: Flush dev-IOTLB only when PCIe device is accessible in scalable mode

Commit 4fc82cd907ac ("iommu/vt-d: Don't issue ATS Invalidation
request when device is disconnected") relies on
pci_dev_is_disconnected() to skip ATS invalidation for
safely-removed devices, but it does not cover link-down caused
by faults, which can still hard-lock the system.

For example, if a VM fails to connect to the PCIe device,
"virsh destroy" is executed to release resources and isolate
the fault, but a hard-lockup occurs while releasing the group fd.

Call Trace:
 qi_submit_sync
 qi_flush_dev_iotlb
 intel_pasid_tear_down_entry
 device_block_translation
 blocking_domain_attach_dev
 __iommu_attach_device
 __iommu_device_set_domain
 __iommu_group_set_domain_internal
 iommu_detach_group
 vfio_iommu_type1_detach_group
 vfio_group_detach_container
 vfio_group_fops_release
 __fput

Although pci_device_is_present() is slower than
pci_dev_is_disconnected(), it still takes only ~70 µs on a
ConnectX-5 (8 GT/s, x2) and becomes even faster as PCIe speed
and width increase.

Besides, devtlb_invalidation_with_pasid() is called only in the
paths below, which are far less frequent than memory map/unmap.

1. mm-struct release
2. {attach,release}_dev
3. set/remove PASID
4. dirty-tracking setup

The gain in system stability far outweighs the negligible cost
of using pci_device_is_present() instead of pci_dev_is_disconnected()
to decide when to skip ATS invalidation, especially under GDR
high-load conditions.

## Affected

- `Linux >= f873b85ec762c5a6abe94a7ddb31df5d3ba07d85 < 581ce094d9eafb78ec4f9de77bd24b780c151236`
- `Linux >= d70f1c85113cd8c2aa8373f491ca5d1b22ec0554 < e2c78c69f8faf2885ea4ceee08c71ac738f401a0`
- `Linux >= 34a7b30f56d30114bf4d436e4dc793afe326fbcf < ead67d0378e90f419e385a43af29435242d80c12`
- `Linux >= 2b74b2a92e524d7c8dec8e02e95ecf18b667c062 < 01aed2f1d7cb8fdf4c60c5bb4727608cb82b401d`
- `Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b < 9813306610d0d718c863aaa70928bf57d7570ec0`
- `Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b < 9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94`
- `Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b < 0da6697e577023d8867c7beb2d16a22510e4eea9`
- `Linux >= 4fc82cd907ac075648789cc3a00877778aa1838b < 10e60d87813989e20eac1f3eda30b3bae461e7f9`
- `Linux c04f2780919f20e2cc4846764221f5e802555868`
- `Linux 025bc6b41e020aeb1e71f84ae3ffce945026de05`
- `Linux >= 5.10.214 < 5.10.252`
- `Linux >= 5.15.153 < 5.15.202`
- `Linux >= 6.1.83 < 6.1.165`
- `Linux >= 6.6.23 < 6.6.128`
- `Linux >= 6.7.11 < 6.8`
- `Linux >= 6.8.2 < 6.9`
- `Linux 6.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.