CVE-2026-31590
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION
Drop the WARN in sev_pin_memory() on npages overflowing an int, as the WARN is comically trivially to trigger from userspace, e.g. by doing:
Note, the checks in sev_mem_enc_register_region() that presumably exist to verify the incoming address+size are completely worthless, as both "addr" and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater than ULONG_MAX. That wart will be cleaned up in the near future.
Opportunistically add a comment to explain why the code calculates the number of pages the "hard" way, e.g. instead of just shifting @ulen.
Detalles técnicos trazas, registros y código del informe original
struct kvm_enc_region range = {
.addr = 0,
.size = -1ul,
};
__vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range);
if (range->addr > ULONG_MAX || range->size > ULONG_MAX)
return -EINVAL;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: 5
- Fecha de la puntuación: 6/10/2026
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 (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914
- https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267
- https://git.kernel.org/stable/c/6a8e3c82122737529b25ef2a048fbcc569d8c055
- https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2
- https://git.kernel.org/stable/c/a703933bcfa5cc76ca10e2048464600e74136099
- https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5
- https://git.kernel.org/stable/c/abcd43ff579abd0a654bb4636086e78819dd5f4c
- https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a
- https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION\n\nDrop the WARN in sev_pin_memory() on npages overflowing an int, as the\nWARN is comically trivially to trigger from userspace, e.g. by doing:\n\n struct kvm_enc_region range = {\n .addr = 0,\n .size = -1ul,\n };\n\n __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range);\n\nNote, the checks in sev_mem_enc_register_region() that presumably exist to\nverify the incoming address+size are completely worthless, as both \"addr\"\nand \"size\" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater\nthan ULONG_MAX. That wart will be cleaned up in the near future.\n\n\tif (range->addr > ULONG_MAX || range->size > ULONG_MAX)\n\t\treturn -EINVAL;\n\nOpportunistically add a comment to explain why the code calculates the\nnumber of pages the \"hard\" way, e.g. instead of just shifting @ulen."
}
],
"lastModified": "2026-06-17T10:34:02.540",
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