---
id: CVE-2025-68744
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Free special fields when update [lru_,]percpu_hash maps

  As [lru_,]percpu_hash maps support BPF_KPTR_{REF,PERCPU}, missing
  calls to 'bpf_obj_free_fields()' in 'pcp…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Free special fields when update [lru_,]percpu_hash maps

  As [lru_,]percpu_hash maps support BPF_KPTR_{REF,PERCPU}, missing
  calls to 'bpf_obj_free_fields()' in 'pcp…
severity: none
published: '2025-12-24'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T10:10:00.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68744'
references:
  - url: 'https://git.kernel.org/stable/c/3bf1378747e251571e0de15e7e0a6bf2919044e7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4a03d69cece145e4fb527464be29c3806aa3221e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6af6e49a76c9af7d42eb923703e7648cb2bf401a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/96a5cb7072cabbac5c66ac9318242c3bdceebb68'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/994d6303ed0b84cbc795bb5becf7ed6de40d3f3c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00187
epssPercentile: 0.07663
ingestedAt: '2026-10-13T10:22:03.518Z'
---

## Overview

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

bpf: Free special fields when update [lru_,]percpu_hash maps

As [lru_,]percpu_hash maps support BPF_KPTR_{REF,PERCPU}, missing
calls to 'bpf_obj_free_fields()' in 'pcpu_copy_value()' could cause the
memory referenced by BPF_KPTR_{REF,PERCPU} fields to be held until the
map gets freed.

Fix this by calling 'bpf_obj_free_fields()' after
'copy_map_value[,_long]()' in 'pcpu_copy_value()'.

## Remediation

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