x86/fred: Correct speculative safety in fred_extint()

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Summary

CVECVE-2026-23354
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 11:16:33 UTC
Updated2026-04-24 19:15:42 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-129

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 14619d912b658ecd9573fb88400d3830a29cadcb 3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643 git Not specified
CNA Linux Linux affected 14619d912b658ecd9573fb88400d3830a29cadcb e58f1a9b0677de24dcfee0b21393446ec92ff120 git Not specified
CNA Linux Linux affected 14619d912b658ecd9573fb88400d3830a29cadcb 92caa5274b99cb6729177232a029ce0dfa6c5f7b git Not specified
CNA Linux Linux affected 14619d912b658ecd9573fb88400d3830a29cadcb aa280a08e7d8fae58557acc345b36b3dc329d595 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.77 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.17 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.7 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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