---
id: CVE-2026-98002
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/amd: Fix ineffective error check in nested domain allocation

  amd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the
  negative errno from ida_all…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/amd: Fix ineffective error check in nested domain allocation

  amd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the
  negative errno from ida_all…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 757d2b1fdf5b7d6eead5963a49b5780617987ab8 <
    80c231f5577229d1e90a1e312b3095f9502f8625
  - >-
    Linux >= 757d2b1fdf5b7d6eead5963a49b5780617987ab8 <
    fa5c0827f0b7bac6d0a188f10118151769ae68fd
  - Linux 7.0
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T15:18:03.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98002'
references:
  - url: 'https://git.kernel.org/stable/c/80c231f5577229d1e90a1e312b3095f9502f8625'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fa5c0827f0b7bac6d0a188f10118151769ae68fd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.862Z'
---

## Overview

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

iommu/amd: Fix ineffective error check in nested domain allocation

amd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the
negative errno from ida_alloc_range() when the ID space is exhausted or
memory is short.  amd_iommu_alloc_domain_nested() stores that return value
in gdom_info->hdom_id, which is a u32, and only then tests it:

	gdom_info->hdom_id = amd_iommu_pdom_id_alloc();
	if (gdom_info->hdom_id <= 0) {

The assignment discards the sign, so -ENOSPC becomes 0xffffffe4 and the
test never fires.  The nested domain is then set up with a host domain ID
that was never allocated, instead of the allocation failing with -ENOSPC.

Keep the value in an int, test it there, and store it only once it is
known to be valid, which is what the other amd_iommu_pdom_id_alloc()
callers already do.

## Remediation

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