---
id: CVE-2026-90299
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix sleepable check for tracing/lsm prog

  When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog
  is allowed to attach to '__x64_'-alike prefix …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix sleepable check for tracing/lsm prog

  When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog
  is allowed to attach to '__x64_'-alike prefix …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 16d9c5660692d6f0e6aba367274de2b6dfd4343c <
    976f1be72740cfbc351d3841fd21186dda3ea723
  - >-
    Linux >= 16d9c5660692d6f0e6aba367274de2b6dfd4343c <
    00244bdaa423d93f4571f3f6854378ce3365e524
  - Linux 7.1
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:27.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90299'
references:
  - url: 'https://git.kernel.org/stable/c/00244bdaa423d93f4571f3f6854378ce3365e524'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/976f1be72740cfbc351d3841fd21186dda3ea723'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.830Z'
epss: 0.00204
epssPercentile: 0.10664
---

## Overview

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

bpf: Fix sleepable check for tracing/lsm prog

When CONFIG_FUNCTION_ERROR_INJECTION is disabled, a sleepable tracing prog
is allowed to attach to '__x64_'-alike prefix symbols.

It is because the verifier does not verify whether the symbol is a kernel
function or a bpf prog. That said, a sleepable tracing prog is allowed to
attach to a bpf prog target whose name has '__x64_'-alike prefix.

For example, a sleepable fentry prog attaches to a '__x64_sys_nop' XDP
prog, and copies buffer from a user pointer with bpf_copy_from_user()
helper. After attaching the XDP prog to lo interface, the kernel BUG
could be triggered by 'ping -c 1 -W 1 127.0.0.1':

[    3.460756] BUG: sleeping function called from invalid context at kernel/bpf/trampoline.c:1324

Fix it by disallowing sleepable prog always when its target
btf is not a kernel's btf.

## Remediation

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