---
id: CVE-2026-90430
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized

  tegra241_vintf_init_lvcmdq() stores the freshly allocated vcmdq pointer to
  the vintf->lvcmdq…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized

  tegra241_vintf_init_lvcmdq() stores the freshly allocated vcmdq pointer to
  the vintf->lvcmdq…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 <
    792f720fc23fe5bd6508d40ed73ae739debd6dcb
  - >-
    Linux >= 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 <
    b4535b403d6bf9bcc24dbd62096711329b9c612c
  - >-
    Linux >= 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 <
    cbc41aacd49e695338940196e7084770365e1b68
  - Linux 6.12
published: '2026-09-17'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:29.013'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90430'
references:
  - url: 'https://git.kernel.org/stable/c/792f720fc23fe5bd6508d40ed73ae739debd6dcb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b4535b403d6bf9bcc24dbd62096711329b9c612c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cbc41aacd49e695338940196e7084770365e1b68'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d5ec248ee1c79354979c23f7f390e856e9535651'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00209
epssPercentile: 0.09826
ingestedAt: '2026-09-17T16:21:47.791Z'
---

## Overview

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

iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized

tegra241_vintf_init_lvcmdq() stores the freshly allocated vcmdq pointer to
the vintf->lvcmdqs[] array, before tegra241_vcmdq_alloc_smmu_cmdq() builds
the vcmdq->cmdq. The error ISR dereferences that cmdq, so a latched LVCMDQ
error (e.g. one inherited across a kexec) firing in this window would make
tegra241_vintf0_handle_error() pass the still-zeroed arm_smmu_cmdq down to
__arm_smmu_cmdq_skip_err(), dereferencing NULL queue register pointers.

Drop the store from tegra241_vintf_init_lvcmdq() and publish the vcmdq at
the end of the allocation instead, with an smp_store_release() that pairs
with an smp_load_acquire() in the ISR, which can see a fully built LVCMDQ
or NULL.

The user-owned LVCMDQ allocation moves accordingly, publishing the vcmdq
once tegra241_vcmdq_hw_init_user() succeeds, using a plain store since a
user VINTF's lvcmdqs[] has no lockless reader -- the error ISR only walks
the VINTF0 array.

## Remediation

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