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CVE-2026-43409

5.5 · MEDIUM

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…

Published May 8, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-43409 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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:0000000

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/8b6767e4141b2a42745b544d4555cf1614ba1a2dRefgit.kernel.org/stable/c/9edc79d664832a842012ad105b1521c1a3c35ab3Refgit.kernel.org/stable/c/b0ca81616a010807e91fc31db9be242b96326adcRefgit.kernel.org/stable/c/cae928e3178c75602c21d67e21255d73e7e9ed4fRefgit.kernel.org/stable/c/e113f0b46d19626ec15388bcb91432c9a4fd6261

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43409?

CVE-2026-43409 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43409?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43409?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43409?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43409 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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