x86/CPU: Fix FPDSS on Zen1

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Summary

CVECVE-2026-31628
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:42 UTC
Updated2026-04-27 20:40:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/CPU: Fix FPDSS on Zen1 Zen1's hardware divider can leave, under certain circumstances, partial results from previous operations. Those results can be leaked by another, attacker thread. Fix that with a chicken bit.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000330000 probability, percentile 0.095380000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 0548529af20e68c6552817834b766646dd3bd7a7 git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 1272cfedf4cd1019ddf583917a99b62f2d3645bb git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 91f02726b2203b71545713ecb7fb006e60a2d66f git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 b731aca06387b195058a9f6449a03b62efa1bd10 git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 ad17f07e95e6e8505e2153e5b391f0d27eacce25 git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 e6af5286efe5a56128b34032572c9ce9ebeccda3 git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 546785c719418c6166834a47e372a88f5f7ae893 git Not specified
CNA Linux Linux affected f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 e55d98e7756135f32150b9b8f75d580d0d4b2dd3 git Not specified
CNA Linux Linux affected 5abd1583e06b3963e5c9d915760367de86808b78 git Not specified
CNA Linux Linux affected 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686 git Not specified
CNA Linux Linux affected 5a63725cd18fcee2af6ec46ccb856b64ad3077b4 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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