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CVE-2026-23274

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and…

Published Mar 20, 2026EPSS 0.18%

Overview

CVE-2026-23274 is a high-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels

IDLETIMER revision 0 rules reuse existing timers by label and always call

mod_timer() on timer->timer.

If the label was created first by revision 1 with XT_IDLETIMER_ALARM,

the object uses alarm timer semantics and timer->timer is never initialized.

Reusing that object from revision 0 causes mod_timer() on an uninitialized

timer_list, triggering debugobjects warnings and possible panic when

panic_on_warn=1.

Fix this by rejecting revision 0 rule insertion when an existing timer with

the same label is of ALARM type.

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/144f88054ba0180467356f40895bd660b5dceeecRefgit.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9Refgit.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cfRefgit.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44Refgit.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491Refgit.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9Refgit.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309Refgit.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23274?

CVE-2026-23274 is a high-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23274?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23274?

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-2026-23274?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23274 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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