PT-2026-39070 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43409

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A crash can occur in the Linux kernel when removing or inserting modules that contain kprobe probes after ftrace has been killed due to errors. This happens because kprobes on ftrace do not correctly handle the kprobe ftrace disabled flag set by the ftrace kill() function, leading to a page fault during the kprobes module callback() process.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-43409

Affected Products

Linux Kernel

References · 16

• https://git.kernel.org/stable/c/8b6767e4141b2a42745b544d4555cf1614ba1a2d · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43409 · Vendor Advisory
• https://git.kernel.org/stable/c/b0ca81616a010807e91fc31db9be242b96326adc · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43409 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43409 · Vendor Advisory
• https://git.kernel.org/stable/c/cae928e3178c75602c21d67e21255d73e7e9ed4f · Patch
• https://ubuntu.com/security/CVE-2026-43409 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43409 · Vendor Advisory
• https://git.kernel.org/stable/c/e113f0b46d19626ec15388bcb91432c9a4fd6261 · Patch
• https://git.kernel.org/stable/c/9edc79d664832a842012ad105b1521c1a3c35ab3 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43409 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-43409 · Security Note
• https://twitter.com/CVEnew/status/2052767669620019265 · Twitter Post
• https://git.kernel.org/linus/e113f0b46d19626ec15388bcb91432c9a4fd6261 · Note
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post