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CVE-2026-90046

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: don't spin_trylock() in NMI on UP Patch series "mm/page_alloc: fixes for free_pages_nolock() on RT/UP".

Published Sep 16, 2026EPSS 0.17%

Overview

CVE-2026-90046 is a high-severity vulnerability. It was published on September 16, 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:

mm/page_alloc: don't spin_trylock() in NMI on UP

Patch series "mm/page_alloc: fixes for free_pages_nolock() on RT/UP".

Pre-existing bugs found by Sashiko during review of this other series:

https://lore.kernel.org/all/[email protected]/

I have not reproduced these bugs, and I suspect there is no real-world

user that is affected by them.

This patch (of 2):

As noted in can_spin_trylock(), using this is unsafe in this context.

commit 620b46ed6ae17 ("mm/page_alloc: return NULL early from

alloc_frozen_pages_nolock() in NMI on UP") fixed this on the alloc side

but missed the free side.

Impact: If BPF programs using these features in NMI (probably tracing) are

present on non-SMP builds this might crash the kernel and is probably

exploitable by local attackers for privilege escalation.

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/06c76d3c389ff504052f64b1acee44651bd847faRefgit.kernel.org/stable/c/3105ae628fb785d48b49256468be4f21a7b3cfc0Refgit.kernel.org/stable/c/68a069b407303e71db371df85036101e8ff59280

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90046?

CVE-2026-90046 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90046?

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-2026-90046?

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-2026-90046?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90046 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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