---
id: CVE-2021-41864
title: >-
  prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel
  before 5.14.12 allows unprivileged users to trigger an eBPF multiplication
  integer overflow with a resultant out-of-bounds write.
summary: >-
  prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel
  before 5.14.12 allows unprivileged users to trigger an eBPF multiplication
  integer overflow with a resultant out-of-bounds write.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: netapp
product: cloud_backup
affected:
  - 'linux_kernel >= 4.6, < 4.9.287'
  - 'linux_kernel >= 4.10, < 4.14.251'
  - 'linux_kernel >= 4.15, < 4.19.211'
  - 'linux_kernel >= 4.20, < 5.4.153'
  - 'linux_kernel >= 5.5, < 5.10.73'
  - 'linux_kernel >= 5.11, < 5.14.12'
  - fedora = 33
  - fedora = 34
  - fedora = 35
  - cloud_backup
  - hci_management_node
  - solidfire
  - h410c_firmware
  - h300s_firmware
  - h500s_firmware
  - h700s_firmware
  - h300e_firmware
  - h500e_firmware
  - h700e_firmware
  - h410s_firmware
  - solidfire_baseboard_management_controller_firmware
  - debian_linux = 9.0
  - debian_linux = 10.0
patched:
  - linux_kernel 5.14.12
published: '2021-10-02'
updated: '2026-08-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41864'
references:
  - url: 'https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.12'
    label: cve@mitre.org
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=30e29a9a2bc6a4888335a6ede968b75cd329657a
    label: cve@mitre.org
  - url: >-
      https://github.com/torvalds/linux/commit/30e29a9a2bc6a4888335a6ede968b75cd329657a
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html'
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7BLLVKYAIETEORUPTFO3TR3C33ZPFXQM/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAT3RERO6QBKSPJBNNRWY3D4NCGTFOS7/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYKURLXBB2555ASWMPDNMBUPD6AG2JKQ/
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20211029-0004/'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2022/dsa-5096'
    label: cve@mitre.org
  - url: 'https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.12'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=30e29a9a2bc6a4888335a6ede968b75cd329657a
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/torvalds/linux/commit/30e29a9a2bc6a4888335a6ede968b75cd329657a
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7BLLVKYAIETEORUPTFO3TR3C33ZPFXQM/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAT3RERO6QBKSPJBNNRWY3D4NCGTFOS7/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYKURLXBB2555ASWMPDNMBUPD6AG2JKQ/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20211029-0004/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2022/dsa-5096'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00409
epssPercentile: 0.32303
ingestedAt: '2026-08-05T18:50:24.876Z'
---

## Overview

prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel before 5.14.12 allows unprivileged users to trigger an eBPF multiplication integer overflow with a resultant out-of-bounds write.

## Affected

- `linux_kernel >= 4.6, < 4.9.287`
- `linux_kernel >= 4.10, < 4.14.251`
- `linux_kernel >= 4.15, < 4.19.211`
- `linux_kernel >= 4.20, < 5.4.153`
- `linux_kernel >= 5.5, < 5.10.73`
- `linux_kernel >= 5.11, < 5.14.12`
- `fedora = 33`
- `fedora = 34`
- `fedora = 35`
- `cloud_backup`
- `hci_management_node`
- `solidfire`
- `h410c_firmware`
- `h300s_firmware`
- `h500s_firmware`
- `h700s_firmware`
- `h300e_firmware`
- `h500e_firmware`
- `h700e_firmware`
- `h410s_firmware`
- `solidfire_baseboard_management_controller_firmware`
- `debian_linux = 9.0`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.14.12`