---
id: CVE-2026-98376
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Use array_map_meta_equal for percpu array inner map replacement

  percpu_array_map_ops.map_meta_equal points to the generic
  bpf_map_meta_equal(), which does not com…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Use array_map_meta_equal for percpu array inner map replacement

  percpu_array_map_ops.map_meta_equal points to the generic
  bpf_map_meta_equal(), which does not com…
severity: high
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T08:16:55.910'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98376'
references:
  - url: 'https://git.kernel.org/stable/c/593980175389a05793f6060aa20e626330960395'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98376.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98376'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2548397'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98376'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98376'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98376.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-98376'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
ingestedAt: '2026-10-09T08:29:41.346Z'
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe:
  - CWE-125
  - CWE-787
epss: 0.00158
epssPercentile: 0.04894
scores:
  vendor: 5.5
  cna: 7.8
---

## Overview

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

bpf: Use array_map_meta_equal for percpu array inner map replacement

percpu_array_map_ops.map_meta_equal points to the generic
bpf_map_meta_equal(), which does not compare max_entries.  When a
percpu array serves as an inner map, replacing it with one that has
fewer max_entries bypasses the check.  Since percpu_array_map_gen_lookup()
inlines the original template's index_mask as a JIT immediate, a lookup
on the replacement map can access pptrs[] out of bounds.

Point percpu_array_map_ops.map_meta_equal to array_map_meta_equal(),
which already enforces the max_entries equality check.

Add a selftest to verify that replacing a percpu array inner map with
a differently-sized one is rejected.

## 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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98376.json)