---
id: CVE-2026-43409
title: 'kprobes: avoid crash when rmmod/insmod after ftrace killed'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  kprobes: avoid crash when rmmod/insmod after ftrace killed

  After we hit ftrace is killed by some errors, the kernel crash if
  we remove modules in which kprobe probes.
  …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b <
    8b6767e4141b2a42745b544d4555cf1614ba1a2d
  - >-
    Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b <
    b0ca81616a010807e91fc31db9be242b96326adc
  - >-
    Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b <
    cae928e3178c75602c21d67e21255d73e7e9ed4f
  - >-
    Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b <
    9edc79d664832a842012ad105b1521c1a3c35ab3
  - >-
    Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b <
    e113f0b46d19626ec15388bcb91432c9a4fd6261
  - Linux 3.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:37:31.886596Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:52.116Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43409'
references:
  - url: 'https://git.kernel.org/stable/c/8b6767e4141b2a42745b544d4555cf1614ba1a2d'
  - url: 'https://git.kernel.org/stable/c/b0ca81616a010807e91fc31db9be242b96326adc'
  - url: 'https://git.kernel.org/stable/c/cae928e3178c75602c21d67e21255d73e7e9ed4f'
  - url: 'https://git.kernel.org/stable/c/9edc79d664832a842012ad105b1521c1a3c35ab3'
  - url: 'https://git.kernel.org/stable/c/e113f0b46d19626ec15388bcb91432c9a4fd6261'
tags:
  - cve.org
epss: 0.00122
epssPercentile: 0.01986
ingestedAt: '2026-11-06T15:54:03.923Z'
---

## Overview

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

kprobes: avoid crash when rmmod/insmod after ftrace killed

After we hit ftrace is killed by some errors, the kernel crash if
we remove modules in which kprobe probes.

BUG: unable to handle page fault for address: fffffbfff805000d
PGD 817fcc067 P4D 817fcc067 PUD 817fc8067 PMD 101555067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 4 UID: 0 PID: 2012 Comm: rmmod Tainted: G        W  OE
Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
RIP: 0010:kprobes_module_callback+0x89/0x790
RSP: 0018:ffff88812e157d30 EFLAGS: 00010a02
RAX: 1ffffffff805000d RBX: dffffc0000000000 RCX: ffffffff86a8de90
RDX: ffffed1025c2af9b RSI: 0000000000000008 RDI: ffffffffc0280068
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1025c2af9a
R10: ffff88812e157cd7 R11: 205d323130325420 R12: 0000000000000002
R13: ffffffffc0290488 R14: 0000000000000002 R15: ffffffffc0280040
FS:  00007fbc450dd740(0000) GS:ffff888420331000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff805000d CR3: 000000010f624000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 notifier_call_chain+0xc6/0x280
 blocking_notifier_call_chain+0x60/0x90
 __do_sys_delete_module.constprop.0+0x32a/0x4e0
 do_syscall_64+0x5d/0xfa0
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

This is because the kprobe on ftrace does not correctly handles
the kprobe_ftrace_disabled flag set by ftrace_kill().

To prevent this error, check kprobe_ftrace_disabled in
__disarm_kprobe_ftrace() and skip all ftrace related operations.

## Affected

- `Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b < 8b6767e4141b2a42745b544d4555cf1614ba1a2d`
- `Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b < b0ca81616a010807e91fc31db9be242b96326adc`
- `Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b < cae928e3178c75602c21d67e21255d73e7e9ed4f`
- `Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b < 9edc79d664832a842012ad105b1521c1a3c35ab3`
- `Linux >= ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b < e113f0b46d19626ec15388bcb91432c9a4fd6261`
- `Linux 3.7`

## Remediation

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