---
id: CVE-2025-38565
title: 'perf/core: Exit early on perf_mmap() fail'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  perf/core: Exit early on perf_mmap() fail

  When perf_mmap() fails to allocate a buffer, it still invokes the
  event_mapped() callback of the related event. On X86 this m…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    5ffda7f3ed76ec8defc19d985e33b3b82ba07839
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    9b90a48c7de828a15c7a4fc565d46999c6e22d6b
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    de85e72598d89880a02170a1cbc27b35a7d978a9
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    27d44145bd576bbef9bf6165bcd78128ec3e6cbd
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    f41e9eba77bf97626e04296dc5677d02816d2432
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    92043120a2e992800580855498ab8507e1b22db9
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    163b0d1a209fe0df5476c1df2330ca12b55abf92
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    7ff8521f30c4c2fcd4e88bd7640486602bf8a650
  - >-
    Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb <
    07091aade394f690e7b655578140ef84d0e8d7b0
  - Linux 4.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:04:06.362645Z'
published: '2025-08-19'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:12:47.389Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38565'
references:
  - url: 'https://git.kernel.org/stable/c/5ffda7f3ed76ec8defc19d985e33b3b82ba07839'
  - url: 'https://git.kernel.org/stable/c/9b90a48c7de828a15c7a4fc565d46999c6e22d6b'
  - url: 'https://git.kernel.org/stable/c/de85e72598d89880a02170a1cbc27b35a7d978a9'
  - url: 'https://git.kernel.org/stable/c/27d44145bd576bbef9bf6165bcd78128ec3e6cbd'
  - url: 'https://git.kernel.org/stable/c/f41e9eba77bf97626e04296dc5677d02816d2432'
  - url: 'https://git.kernel.org/stable/c/92043120a2e992800580855498ab8507e1b22db9'
  - url: 'https://git.kernel.org/stable/c/163b0d1a209fe0df5476c1df2330ca12b55abf92'
  - url: 'https://git.kernel.org/stable/c/7ff8521f30c4c2fcd4e88bd7640486602bf8a650'
  - url: 'https://git.kernel.org/stable/c/07091aade394f690e7b655578140ef84d0e8d7b0'
tags:
  - cve.org
epss: 0.00191
epssPercentile: 0.08773
ingestedAt: '2026-11-05T22:38:31.993Z'
---

## Overview

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

perf/core: Exit early on perf_mmap() fail

When perf_mmap() fails to allocate a buffer, it still invokes the
event_mapped() callback of the related event. On X86 this might increase
the perf_rdpmc_allowed reference counter. But nothing undoes this as
perf_mmap_close() is never called in this case, which causes another
reference count leak.

Return early on failure to prevent that.

## Affected

- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 5ffda7f3ed76ec8defc19d985e33b3b82ba07839`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 9b90a48c7de828a15c7a4fc565d46999c6e22d6b`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < de85e72598d89880a02170a1cbc27b35a7d978a9`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 27d44145bd576bbef9bf6165bcd78128ec3e6cbd`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < f41e9eba77bf97626e04296dc5677d02816d2432`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 92043120a2e992800580855498ab8507e1b22db9`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 163b0d1a209fe0df5476c1df2330ca12b55abf92`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 7ff8521f30c4c2fcd4e88bd7640486602bf8a650`
- `Linux >= 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb < 07091aade394f690e7b655578140ef84d0e8d7b0`
- `Linux 4.0`

## Remediation

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