---
id: CVE-2026-90143
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: kcm: Hold RCU read lock while running BPF parser

  kcm_parse_func_strparser() calls bpf_prog_run_pin_on_cpu() which
  prevents CPU migration, but does not establish a…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: kcm: Hold RCU read lock while running BPF parser

  kcm_parse_func_strparser() calls bpf_prog_run_pin_on_cpu() which
  prevents CPU migration, but does not establish a…
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 >= 9b73896a81dc68a638a011877b7344b252f92276 <
    37108861cf7bd909d4a372069bcd61c8f489e232
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    3c70d27e792a28bca650ddd8a9aa0fe3591ffec5
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    1d26a6e007d46babc7fa76e5a157dccf86cd55c0
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    21526f8a191a3c50622b8c10bd927870d780eae4
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    292846223eaddba890e40699d2ab82ee5671798c
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    f392affef3c9ce64dfdde794df0579e0a7793440
  - >-
    Linux >= 9b73896a81dc68a638a011877b7344b252f92276 <
    b0346dd64e4905291cc9c479f2e6cf1884ced4e6
  - Linux 4.9
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:43.690'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90143'
references:
  - url: 'https://git.kernel.org/stable/c/1d26a6e007d46babc7fa76e5a157dccf86cd55c0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/21526f8a191a3c50622b8c10bd927870d780eae4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/292846223eaddba890e40699d2ab82ee5671798c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/37108861cf7bd909d4a372069bcd61c8f489e232'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3c70d27e792a28bca650ddd8a9aa0fe3591ffec5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0346dd64e4905291cc9c479f2e6cf1884ced4e6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f392affef3c9ce64dfdde794df0579e0a7793440'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00164
epssPercentile: 0.06021
ingestedAt: '2026-09-17T16:21:47.877Z'
---

## Overview

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

net: kcm: Hold RCU read lock while running BPF parser

kcm_parse_func_strparser() calls bpf_prog_run_pin_on_cpu() which
prevents CPU migration, but does not establish an RCU read-side
critical section. Consequently, BPF map operations can trigger
WARN_ON_ONCE(!bpf_rcu_lock_held()) when called from the KCM strparser
program.

Hold the RCU read lock while running the program.

## Remediation

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