CVE-2026-98433
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:
KVM: PPC: Book3S HV: corrección de fuga de página de dispositivo seguro en fallo de uv_page_in()
En kvmppc_svm_page_in(), si uv_page_in() falla después de que kvmppc_uvmem_get_page() haya tenido éxito, la página de dispositivo seguro nunca se libera. kvmppc_uvmem_get_page() establece un bit en kvmppc_uvmem_bitmap, asigna una estructura kvmppc_uvmem_page_pvt, marca el GFN como KVMPPC_GFN_UVMEM_PFN y llama a zone_device_page_init(), que establece refcount=1 y bloquea la página. El goto out_finalize posterior omite la asignación de *mig.dst, por lo que migrate_vma_finalize() no hace nada con la página y ninguno de esos recursos llega a recuperarse nunca.
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Cada ocurrencia consume de forma permanente una entrada del grupo de memoria segura limitado por el firmware (kvmppc_uvmem_bitmap), filtra pvt y deja el GFN marcado como seguro, lo que lo hace inutilizable durante toda la vida de la máquina virtual.
El gemelo __kvmppc_svm_page_out() ya gestiona correctamente el análogo fallo de uv_page_out() con unlock_page(dpage); __free_page(dpage). Se aplica aquí el mismo patrón: unlock_page() seguido de put_page(), que encadena a través de free_zone_device_folio() hasta kvmppc_uvmem_folio_free() para limpiar el bit del mapa de bits, liberar pvt y restablecer el estado del GFN.
Alcanzable siempre que uv_page_in() devuelva un error (por ejemplo, por agotamiento del grupo de UV) en cualquier sistema POWER9/10 con Ultravisor/PEF.
Traducción automática del texto original de NVD (en inglés).
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días
- 0.16 %
- Percentil entre todas las CVEs puntuadas
- 5
- Fecha de la puntuación
- 21/10/2026
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)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
Mostrar las 8 referencias
- https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa
- https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba
- https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae
- https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388
- https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50
- https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95
- https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b
- https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98433",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "ed2f2ff63cb7e71204096e765c6d02c3b6974b95",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "8f3b7746874b39fc20e0363c9076c7787d4765ba",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "a933d7024359e2e566b07903d1294b84f90482ae",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "c41088b2765af1e97e7bb05f906ae1823eca0388",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "dfb84274932737e338ff5eb27f34b4c8ecb01b50",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "fcbff8008b0e08cd53b611bd0ff7e01f5b962f80",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "0a416ee20bcccddf91ca5b63696a23b9d11d73aa",
"versionType": "git"
}
],
"programFiles": [
"arch/powerpc/kvm/book3s_hv_uvmem.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/powerpc/kvm/book3s_hv_uvmem.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T15:16:53.047",
"references": [
{
"url": "https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure\n\nIn kvmppc_svm_page_in(), if uv_page_in() fails after\nkvmppc_uvmem_get_page() has succeeded, the secure device page is never\nreleased. kvmppc_uvmem_get_page() sets a bit in kvmppc_uvmem_bitmap,\nallocates a kvmppc_uvmem_page_pvt struct, marks the GFN as\nKVMPPC_GFN_UVMEM_PFN, and calls zone_device_page_init() which sets\nrefcount=1 and locks the page. The subsequent goto out_finalize skips\nthe *mig.dst assignment, so migrate_vma_finalize() is a no-op for the\npage, and none of those resources are ever reclaimed.\n\nEach occurrence permanently consumes one entry from the firmware-bounded\nsecure memory pool (kvmppc_uvmem_bitmap), leaks pvt, and leaves the GFN\nmarked as secure — making it unusable for the lifetime of the VM.\n\nThe twin __kvmppc_svm_page_out() already handles the analogous uv_page_out()\nfailure correctly with unlock_page(dpage); __free_page(dpage). Apply\nthe same pattern here: unlock_page() followed by put_page(), which\nchains through free_zone_device_folio() into kvmppc_uvmem_folio_free()\nto clear the bitmap bit, free pvt, and reset the GFN state.\n\nReachable whenever uv_page_in() returns an error (e.g. UV pool\nexhaustion) on any POWER9/10 + Ultravisor/PEF system."
}
],
"lastModified": "2026-10-19T10:18:51.290",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}