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CVE-2026-72436

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless…

Published Aug 15, 2026EPSS 0.72%

Overview

CVE-2026-72436 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

Sashiko pointed out that there are a few lockless RCU readers

using test_bit() which is a relaxed atomic operation and

provides no memory barrier guarantees. Use test_bit_acquire()

instead where the operation may run parallel with add/del/gc,

i.e. is not one from the next cases

- protected by region lock

- in a set destroy phase

- in a new/temporary set creation phase

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/3219d74e4536658c937fd878a327257b86ce80ddRefgit.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0Refgit.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7Refgit.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710Refgit.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1bRefgit.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72436?

CVE-2026-72436 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-72436?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72436?

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-2026-72436?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72436 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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