iommu/vt-d: Fix RB-tree corruption in probe error path (CVE-2026-74355) | HOL Guard CVE

High · CVSS 8.2CVE-2026-74355

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

Answer in brief

CVE-2026-74355 records a High severity (CVSS 8.2) vulnerability in iommu/vt-d: Fix RB-tree corruption in probe error path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 30, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.2
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=4f1492efb495bcef34c9ee8a94af81e6cea5abf4 <f5102e0fc3c6dc8685549891a96e4589fdb3e211 \|\| >=4f1492efb495bcef34c9ee8a94af81e6cea5abf4 <d16923a45d4d08367650fdc3451c89299ab6ac5a \|\| >=4f1492efb495bcef34c9ee8a94af81e6cea5abf4 <43bd9e6d5513cb1edbafdeef146a1edc3aaced56	f5102e0fc3c6dc8685549891a96e4589fdb3e211, d16923a45d4d08367650fdc3451c89299ab6ac5a, 43bd9e6d5513cb1edbafdeef146a1edc3aaced56
Linux/Linuxgeneric	6.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to f5102e0fc3c6dc8685549891a96e4589fdb3e211 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

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().

Quoted source text, attributed separately from HOL analysis.