KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish

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Summary

CVECVE-2026-31591
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:36 UTC
Updated2026-04-28 20:34:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish Lock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as allowing userspace to manipulate and/or run a vCPU while its state is being synchronized would at best corrupt vCPU state, and at worst crash the host kernel. Opportunistically assert that vcpu->mutex is held when synchronizing its VMSA (the SEV-ES path already locks vCPUs).

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: 0.000180000 probability, percentile 0.046080000 (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 ad27ce155566f2b4400fa865859834592bd18777 30fd9d8c82087742168db779929d8be0459b0716 git Not specified
CNA Linux Linux affected ad27ce155566f2b4400fa865859834592bd18777 4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5 git Not specified
CNA Linux Linux affected ad27ce155566f2b4400fa865859834592bd18777 c87938fc7d99a06a7e5477c45b4e5a4148f85d66 git Not specified
CNA Linux Linux affected ad27ce155566f2b4400fa865859834592bd18777 cb923ee6a80f4e604e6242a4702b59251e61a380 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 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/4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c87938fc7d99a06a7e5477c45b4e5a4148f85d66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/30fd9d8c82087742168db779929d8be0459b0716 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cb923ee6a80f4e604e6242a4702b59251e61a380 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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