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CVE-2026-43010

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject sleepable kprobe_multi programs at attach time kprobe.multi programs run in atomic/RCU context and cannot sleep.

Published May 1, 2026EPSS 0.12%

Overview

CVE-2026-43010 is a medium-severity vulnerability. It was published on May 1, 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:

bpf: Reject sleepable kprobe_multi programs at attach time

kprobe.multi programs run in atomic/RCU context and cannot sleep.

However, bpf_kprobe_multi_link_attach() did not validate whether the

program being attached had the sleepable flag set, allowing sleepable

helpers such as bpf_copy_from_user() to be invoked from a non-sleepable

context.

This causes a "sleeping function called from invalid context" splat:

BUG: sleeping function called from invalid context at ./include/linux/uaccess.h:169

in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1787, name: sudo

preempt_count: 1, expected: 0

RCU nest depth: 2, expected: 0

Fix this by rejecting sleepable programs early in

bpf_kprobe_multi_link_attach(), before any further processing.

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/89327ed787746a7aa4db3c97f91d2e294228932bRefgit.kernel.org/stable/c/d97b19fe5265f7901b2c862f88a4eb1b129a0b61Refgit.kernel.org/stable/c/dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3Refgit.kernel.org/stable/c/eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8Refgit.kernel.org/stable/c/f952157e695fd434bdc05af63a703bb082a78717

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43010?

CVE-2026-43010 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43010?

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-2026-43010?

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-2026-43010?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43010 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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