CVE-2025-38560
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
x86/sev: Evict cache lines during SNP memory validation
An SNP cache coherency vulnerability requires a cache line eviction mitigation when validating memory after a page state change to private. The specific mitigation is to touch the first and last byte of each 4K page that is being validated. There is no need to perform the mitigation when performing a page state change to shared and rescinding validation.
CPUID bit Fn8000001F_EBX[31] defines the COHERENCY_SFW_NO CPUID bit that, when set, indicates that the software mitigation for this vulnerability is not needed.
Leer descripción completaMostrar menos
Implement the mitigation and invoke it when validating memory (making it private) and the COHERENCY_SFW_NO bit is not set, indicating the SNP guest is vulnerable.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022
- https://git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6a
- https://git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1e
- https://git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8
- https://git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdf
- https://git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45b
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/sev: Evict cache lines during SNP memory validation\n\nAn SNP cache coherency vulnerability requires a cache line eviction\nmitigation when validating memory after a page state change to private.\nThe specific mitigation is to touch the first and last byte of each 4K\npage that is being validated. There is no need to perform the mitigation\nwhen performing a page state change to shared and rescinding validation.\n\nCPUID bit Fn8000001F_EBX[31] defines the COHERENCY_SFW_NO CPUID bit\nthat, when set, indicates that the software mitigation for this\nvulnerability is not needed.\n\nImplement the mitigation and invoke it when validating memory (making it\nprivate) and the COHERENCY_SFW_NO bit is not set, indicating the SNP\nguest is vulnerable."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/sev: Expulsar líneas de caché durante la validación de memoria SNP Una vulnerabilidad de coherencia de caché SNP requiere una mitigación de expulsión de línea de caché al validar la memoria después de un cambio de estado de página a privado. La mitigación específica es tocar el primer y el último byte de cada página de 4K que se está validando. No es necesario realizar la mitigación cuando se realiza un cambio de estado de página a compartido y se rescinde la validación. El bit CPUID Fn8000001F_EBX[31] define el bit COHERENCY_SFW_NO CPUID que, cuando se establece, indica que no se necesita la mitigación de software para esta vulnerabilidad. Implemente la mitigación e invóquela al validar la memoria (haciéndola privada) y el bit COHERENCY_SFW_NO no está establecido, lo que indica que el invitado SNP es vulnerable."
}
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"lastModified": "2026-07-30T06:23:25.960",
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