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Vulnerability record · CVE-2026-23354 · published 25 March 2026

CVE-2026-23354: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-129 · CWE-129
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643 Patch
https://git.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7b Patch
https://git.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595 Patch
https://git.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23354), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.