---
id: CVE-2026-98145
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  accel/amdxdna: reject a command chain that carries no commands

  A chain whose command_count is zero passes the payload length check,
  because struct_size(payload, data, …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  accel/amdxdna: reject a command chain that carries no commands

  A chain whose command_count is zero passes the payload length check,
  because struct_size(payload, data, …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf <
    ed74e8d603df457bfcf16ed4f8f1660a1525759e
  - >-
    Linux >= 8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf <
    ef6d27af71e1dc43181ec797a6aaa77c27c36786
  - Linux 7.1
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:46.043'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98145'
references:
  - url: 'https://git.kernel.org/stable/c/ed74e8d603df457bfcf16ed4f8f1660a1525759e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ef6d27af71e1dc43181ec797a6aaa77c27c36786'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.808Z'
---

## Overview

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

accel/amdxdna: reject a command chain that carries no commands

A chain whose command_count is zero passes the payload length check,
because struct_size(payload, data, 0) is just the header. The fill loop
then does not run, so offset stays zero and the request is submitted with
a zero-length buffer.

On firmware without AIE2_NPU_COMMAND that ends at the opcode check, since
op is still ERT_INVALID_CMD and aie2_get_chain_msg_op() answers
MSG_OP_MAX_OPCODE. aie2_get_npu_chain_msg_op() answers
MSG_OP_CHAIN_EXEC_NPU whatever it is given, so there the submission
continues to drm_clflush_virt_range(cmd_buf, 0), which reads the byte
before the buffer and faults on the vmap guard page. EXEC_CMD is
reachable by any process that can open the render node.

Reject the request instead.

## Remediation

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