CVE-2026-31591

In 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).

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/30fd9d8c82087742168db779929d8be0459b0716	Patch
https://git.kernel.org/stable/c/4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5	Patch
https://git.kernel.org/stable/c/c87938fc7d99a06a7e5477c45b4e5a4148f85d66	Patch
https://git.kernel.org/stable/c/cb923ee6a80f4e604e6242a4702b59251e61a380	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::::::::

History

11 Nov 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: KVM: SEV: Bloquear todas las vCPU al sincronizar las VMSA para la finalización del lanzamiento de SNP Bloquear todas las vCPU al sincronizar y cifrar las VMSA para los invitados SNP, ya que permitir que el espacio de usuario manipule y/o ejecute una vCPU mientras su estado está siendo sincronizado, en el mejor de los casos corrompería el estado de la vCPU, y en el peor de los casos, provocaría un fallo en el kernel del host. Afirmar de forma oportunista que vcpu -> mutex está retenido al sincronizar su VMSA (la ruta SEV-ES ya bloquea las vCPU).

Information

Published : 2026-04-24 15:16

Updated : 2026-11-11 23:10

NVD link : CVE-2026-31591

Mitre link : CVE-2026-31591

CVE.ORG link : CVE-2026-31591

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo

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Bloquear todas las vCPU al sincronizar las VMSA para la finalizaci\u00f3n del lanzamiento de SNP\n\nBloquear todas las vCPU al sincronizar y cifrar las VMSA para los invitados SNP, ya que permitir que el espacio de usuario manipule y/o ejecute una vCPU mientras su estado est\u00e1 siendo sincronizado, en el mejor de los casos corromper\u00eda el estado de la vCPU, y en el peor de los casos, provocar\u00eda un fallo en el kernel del host.\n\nAfirmar de forma oportunista que vcpu -> mutex est\u00e1 retenido al sincronizar su VMSA (la ruta SEV-ES ya bloquea las vCPU)."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "869D463B-A4DE-4ED4-8FBA-396042335402", "versionEndExcluding": "6.18.24", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": 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