---
id: CVE-2026-97496
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdkfd: Fix OOB memory exposure in get_wave_state()

  The get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and
  cp_hqd_cntl_stack_offset values read dir…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdkfd: Fix OOB memory exposure in get_wave_state()

  The get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and
  cp_hqd_cntl_stack_offset values read dir…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-125
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 42c6c48214b726c30918e8dc80e2168607d13ae4 <
    e2bef0f168be46692a6b900916ff5da3771480ed
  - >-
    Linux >= 42c6c48214b726c30918e8dc80e2168607d13ae4 <
    d9183d974ddd5f09d029beaf359275ac20d4d5fe
  - >-
    Linux >= 42c6c48214b726c30918e8dc80e2168607d13ae4 <
    ec646686613d8ab05b282d1463a7baa49fd6b83b
  - >-
    Linux >= 42c6c48214b726c30918e8dc80e2168607d13ae4 <
    7ef144458f48d5589e36f1b3d83e83db2e5c5ba5
  - Linux 5.18
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:59.480'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97496'
references:
  - url: 'https://git.kernel.org/stable/c/7ef144458f48d5589e36f1b3d83e83db2e5c5ba5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d9183d974ddd5f09d029beaf359275ac20d4d5fe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e2bef0f168be46692a6b900916ff5da3771480ed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ec646686613d8ab05b282d1463a7baa49fd6b83b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97496.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97496'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540554'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97496'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97496'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97496.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00125
epssPercentile: 0.02199
scores:
  nvd: 7.1
  vendor: 7
ingestedAt: '2026-09-24T16:47:15.866Z'
---

## Overview

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

drm/amdkfd: Fix OOB memory exposure in get_wave_state()

The get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and
cp_hqd_cntl_stack_offset values read directly from the MQD, which are
written by GPU microcode and fully attacker-controlled on the
CRIU-restore path (via AMDKFD_IOC_RESTORE_PROCESS with H3).

this leads to an unbounded copy_to_user() that can leak adjacent
GTT/kernel memory. If offset > size, integer underflow produces a ~4 GiB
read length, if size is set to 1 MiB against a 4 KiB allocation, we leak
1 MiB of adjacent kernel memory (other queues' MQDs, ring buffers, KASLR
pointers).

Fix by clamping both cp_hqd_cntl_stack_size to the actual allocated
buffer size (q->ctl_stack_size) and cp_hqd_cntl_stack_offset to the
clamped size before performing arithmetic and copy_to_user().

This ensures we never read beyond the allocated kernel BO regardless of
attacker-supplied MQD field values.

## 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 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97496.json)