---
id: CVE-2026-90392
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix potential UAF when reading bpf link info

  In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is
  accessed without holding any locks
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix potential UAF when reading bpf link info

  In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is
  accessed without holding any locks. If the prog is…
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'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <
    a5c936ac904767fc1d943d40b0308bcb2ae2509b
  - >-
    Linux >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <
    d7d7208e2603b45724b684f4df73904fb347741e
  - >-
    Linux >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <
    85cf991c881e7198be32be05a9daa2625390c8b3
  - >-
    Linux >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <
    79347e42cfbc9e78872922e8f08a70609c9af82f
  - >-
    Linux >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab <
    863f3ddd0b8ac65abfb50d3be0869268ac0e277b
  - Linux 5.7
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:56.940'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90392'
references:
  - url: 'https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00175
epssPercentile: 0.06162
ingestedAt: '2026-09-17T16:21:47.803Z'
---

## Overview

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

bpf: Fix potential UAF when reading bpf link info

In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is
accessed without holding any locks. If the prog is concurrently replaced
via bpf_link_update, the old prog can be freed, leading to a potential
UAF issue.

Fix this by accessing link->prog under RCU protection to safely fetch
the pointer and guarantee its lifetime while reading its fields.

## Remediation

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