---
id: CVE-2026-74355
title: 'iommu/vt-d: Fix RB-tree corruption in probe error path'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/vt-d: Fix RB-tree corruption in probe error path

  The info->node RB-tree member is zero-initialized via kzalloc. If
  a device does not support ATS, the device_rbtr…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 <
    f5102e0fc3c6dc8685549891a96e4589fdb3e211
  - >-
    Linux >= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 <
    d16923a45d4d08367650fdc3451c89299ab6ac5a
  - >-
    Linux >= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 <
    43bd9e6d5513cb1edbafdeef146a1edc3aaced56
  - Linux 6.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:54:21.858928Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:55:35.014Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74355'
references:
  - url: 'https://git.kernel.org/stable/c/f5102e0fc3c6dc8685549891a96e4589fdb3e211'
  - url: 'https://git.kernel.org/stable/c/d16923a45d4d08367650fdc3451c89299ab6ac5a'
  - url: 'https://git.kernel.org/stable/c/43bd9e6d5513cb1edbafdeef146a1edc3aaced56'
tags:
  - cve.org
epss: 0.00181
epssPercentile: 0.07135
ingestedAt: '2026-10-16T19:46:24.375Z'
---

## Overview

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

iommu/vt-d: Fix RB-tree corruption in probe error path

The info->node RB-tree member is zero-initialized via kzalloc. If
a device does not support ATS, the device_rbtree_insert() call is
skipped. If a subsequent probe step fails, the error path jumps to
device_rbtree_remove(), which misinterprets the zeroed node as
a tree root and corrupts the device RB-tree.

Fix this by explicitly initializing the RB-node as empty using
RB_CLEAR_NODE() during initialization and guarding the removal with
RB_EMPTY_NODE().

## Affected

- `Linux >= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 < f5102e0fc3c6dc8685549891a96e4589fdb3e211`
- `Linux >= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 < d16923a45d4d08367650fdc3451c89299ab6ac5a`
- `Linux >= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 < 43bd9e6d5513cb1edbafdeef146a1edc3aaced56`
- `Linux 6.15`

## Remediation

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