---
id: CVE-2026-74355
title: |-
  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
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'
cwe:
  - CWE-824
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:17:41.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74355'
references:
  - url: 'https://git.kernel.org/stable/c/43bd9e6d5513cb1edbafdeef146a1edc3aaced56'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d16923a45d4d08367650fdc3451c89299ab6ac5a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f5102e0fc3c6dc8685549891a96e4589fdb3e211'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74355.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-74355'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2516855'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-74355'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74355'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026081500-CVE-2026-74355-99a3@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00181
epssPercentile: 0.07562
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:54:21.858928Z'
scores:
  nvd: 8.2
  vendor: 5.5
  cna: 8.2
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().

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74355.json)