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CVE-2026-23354

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: x86/fred: Correct speculative safety in fred_extint() array_index_nospec() is no use if the result gets spilled to the stack, a…

Published Mar 25, 2026CWE-129EPSS 0.13%

Overview

CVE-2026-23354 is a high-severity vulnerability. It was published on March 25, 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:

x86/fred: Correct speculative safety in fred_extint()

array_index_nospec() is no use if the result gets spilled to the stack, as

it makes the believed safe-under-speculation value subject to memory

predictions.

For all practical purposes, this means array_index_nospec() must be used in

the expression that accesses the array.

As the code currently stands, it's the wrong side of irqentry_enter(), and

'index' is put into %ebp across the function call.

Remove the index variable and reposition array_index_nospec(), so it's

calculated immediately before the array access.

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/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643Refgit.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7bRefgit.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595Refgit.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23354?

CVE-2026-23354 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23354?

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-2026-23354?

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-2026-23354?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23354 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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