---
id: CVE-2025-40359
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  perf/x86/intel: Fix KASAN global-out-of-bounds warning

  When running "perf mem record" command on CWF, the below KASAN
  global-out-of-bounds warning is seen.

    ========…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  perf/x86/intel: Fix KASAN global-out-of-bounds warning

  When running "perf mem record" command on CWF, the below KASAN
  global-out-of-bounds warning is seen.

    ========…
severity: none
published: '2025-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40359'
references:
  - url: 'https://git.kernel.org/stable/c/0ba6502ce167fc3d598c08c2cc3b4ed7ca5aa251'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1b61a1da3d8105ea1be548c94c2856697eb7ffd1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/710a72e81a7028e1ad1a10eb14f941f8dd45ffd3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00199
epssPercentile: 0.09
ingestedAt: '2026-10-14T13:30:58.440Z'
---

## Overview

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

perf/x86/intel: Fix KASAN global-out-of-bounds warning

When running "perf mem record" command on CWF, the below KASAN
global-out-of-bounds warning is seen.

  ==================================================================
  BUG: KASAN: global-out-of-bounds in cmt_latency_data+0x176/0x1b0
  Read of size 4 at addr ffffffffb721d000 by task dtlb/9850

  Call Trace:

   kasan_report+0xb8/0xf0
   cmt_latency_data+0x176/0x1b0
   setup_arch_pebs_sample_data+0xf49/0x2560
   intel_pmu_drain_arch_pebs+0x577/0xb00
   handle_pmi_common+0x6c4/0xc80

The issue is caused by below code in __grt_latency_data(). The code
tries to access x86_hybrid_pmu structure which doesn't exist on
non-hybrid platform like CWF.

        WARN_ON_ONCE(hybrid_pmu(event->pmu)->pmu_type == hybrid_big)

So add is_hybrid() check before calling this WARN_ON_ONCE to fix the
global-out-of-bounds access issue.

## Remediation

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