---
id: CVE-2026-90210
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure

  When bpf_trampoline_update() fails before modify_fentry_multi()/
  unregister_fentry_multi() is called…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure

  When bpf_trampoline_update() fails before modify_fentry_multi()/
  unregister_fentry_multi() is called…
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 >= aef4dfa790b22d8052cfb78044eadbe03c876c39 <
    65c3939656fd7848e9274faa07c26748b5bf049c
  - >-
    Linux >= aef4dfa790b22d8052cfb78044eadbe03c876c39 <
    0253073fb7d79a2dd2eae9581ea16db2aef395a6
  - Linux 7.2
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:46.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90210'
references:
  - url: 'https://git.kernel.org/stable/c/0253073fb7d79a2dd2eae9581ea16db2aef395a6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/65c3939656fd7848e9274faa07c26748b5bf049c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00154
epssPercentile: 0.04909
ingestedAt: '2026-09-17T16:21:47.858Z'
---

## Overview

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

bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure

When bpf_trampoline_update() fails before modify_fentry_multi()/
unregister_fentry_multi() is called, cur_image is unchanged
(cur_image == old_image) and ftrace still calls into it.  Freeing
old_image in that case causes a UAF.

Only free old_image when it differs from cur_image.

## Remediation

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