KVM: x86: use array_index_nospec with indices that come from guest

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Summary

CVECVE-2025-39823
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-16 13:16:00 UTC
Updated2026-05-12 13:17:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: x86: use array_index_nospec with indices that come from guest min and dest_id are guest-controlled indices. Using array_index_nospec() after the bounds checks clamps these values to mitigate speculative execution side-channels.

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 4180bf1b655a791a0a6ef93a2ffffc762722c782 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48 git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 31a0ad2f60cb4816e06218b63e695eb72ce74974 git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 d51e381beed5e2f50f85f49f6c90e023754efa12 git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 f49161646e03d107ce81a99c6ca5da682fe5fb69 git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 67a05679621b7f721bdba37a5d18665d3aceb695 git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 f57a4bd8d6cb5af05b8ac1be9098e249034639fb git Not specified
CNA Linux Linux affected 4180bf1b655a791a0a6ef93a2ffffc762722c782 c87bd4dd43a624109c3cc42d843138378a7f4548 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 5.4.298 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.242 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.191 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.150 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.104 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.45 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.5 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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