CVE-2026-23354

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 v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.9:-::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc1::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc2::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc3::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc4::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc5::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc6::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc7::::::

History

No history.

Information

Published : 2026-03-25 11:16

Updated : 2026-06-17 10:21

NVD link : CVE-2026-23354

Mitre link : CVE-2026-23354

CVE.ORG link : CVE-2026-23354

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-129

Improper Validation of Array Index

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[{"lang": "en", "value": "CWE-129"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fred: Correct speculative safety in fred_extint()\n\narray_index_nospec() is no use if the result gets spilled to the stack, as\nit makes the believed safe-under-speculation value subject to memory\npredictions.\n\nFor all practical purposes, this means array_index_nospec() must be used in\nthe expression that accesses the array.\n\nAs the code currently stands, it's the wrong side of irqentry_enter(), and\n'index' is put into %ebp across the function call.\n\nRemove the index variable and reposition array_index_nospec(), so it's\ncalculated immediately before the array access."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nx86/fred: Corregir la seguridad especulativa en fred_extint()\n\narray_index_nospec() no sirve de nada si el resultado se vuelca a la pila, ya que hace que el valor considerado seguro bajo especulaci\u00f3n est\u00e9 sujeto a predicciones de memoria.\n\nPara todos los prop\u00f3sitos pr\u00e1cticos, esto significa que array_index_nospec() debe usarse en la expresi\u00f3n que accede al array.\n\nTal como est\u00e1 el c\u00f3digo actualmente, est\u00e1 en el lado incorrecto de irqentry_enter(), y 'index' se coloca en %ebp a trav\u00e9s de la llamada a la funci\u00f3n.\n\nEliminar la variable index y reposicionar array_index_nospec(), para que se calcule inmediatamente antes del acceso al array."}], "lastModified": "2026-06-17T10:21:24.957", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6BF58074-7CF5-43A3-A4ED-82674E37A312", "versionEndExcluding": "6.12.77", "versionStartIncluding": "6.9.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A5E006E4-59C7-43C1-9231-62A72219F2BA", 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