CVE-2026-74355High· 8.2▾ Twilight

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

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…

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score45/ 100 · Moderate

impact 45.1 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Aug 15, 2026

Updated

Oct 16, 2026

CVSS

8.2

Vendor

Red Hat

Product

Red Hat Enterprise Linux 9

CWE

CWE-824

Depth score

45 · Moderate

EPSS

0.18% · p8

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Scores by source

NVD 8.2 · CNA 8.2 · Vendor 5.5⚖ 2.7-point dispute

CISA SSVC

decided 2026-10-16

Exploitation: none
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 16.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

7 events · 74 days

Aug 15, 2026Published
Disclosed via NVD
Oct 16, 2026Record revised
Last analysed / modified upstream
Oct 16, 2026EPSS first tracked
0.2%
Oct 17, 2026CVSS changed
8.2 → 5.5
Oct 17, 2026Severity changed
high → medium
Oct 27, 2026CVSS changed
5.5 → 8.2
Oct 27, 2026Severity changed
medium → high

Red Hat CWE-824 #nvd #csaf #vex #red-hat #cve.org #score-dispute

Affected

enterprise_linux 10
enterprise_linux 9

Full technical detail▾

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

References

Change history

Field changes observed since this record was first indexed.

Oct 27, 2026CVSS 5.5 → 8.2
Oct 27, 2026Severity medium → high
Oct 17, 2026CVSS 8.2 → 5.5
Oct 17, 2026Severity high → medium

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#csaf#vex#red-hat#cve.org#score-dispute

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