CVE-2026-98640
Estado: RecibidaSin puntuar—
Gravedad—Sin puntuar
Probabilidad de explotación0.21 %mayor que el 10 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
HID: amd_sfh: Validate PCI BAR size before mapping
El controlador amd_sfh asigna el BAR 2 de PCI mediante pcim_iomap_regions() y, posteriormente, accede a los registros MMIO con desplazamientos de hasta 0x10958 (por ejemplo, AMD_P2C_MSG3 en 0x1068C). Sin embargo, el controlador nunca comprueba que el tamaño del BAR sea suficiente para cubrir esos accesos. Si el controlador se vincula a un dispositivo con un BAR 2 más pequeño, se produce un acceso de memoria fuera de límites y un fallo de página durante la función de sondeo (probe).
Leer descripción completaMostrar menos
Por ejemplo, puede producirse un fallo de página al leer privdata->mmio + AMD_P2C_MSG3 en mp2_select_ops():
Se corrige verificando que la longitud del BAR 2 sea de al menos 128 KB antes de intentar asignarlo. Dado que el desplazamiento máximo accedido es 0x10958 y los tamaños de los BAR de PCI son potencias de 2, cualquier hardware legítimo tendrá un tamaño de BAR de al menos 128 KB.
Detalles técnicos trazas, registros y código del informe original
BUG: unable to handle page fault for address: ffffc9000390368c PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 105b64067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN NOPTI RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline] RIP: 0010:mp2_select_ops drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:282 [inline] RIP: 0010:amd_mp2_pci_probe+0x337/0x5f0 drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:487 Call Trace: <TASK> local_pci_probe drivers/pci/pci-driver.c:332 [inline] pci_call_probe drivers/pci/pci-driver.c:394 [inline] __pci_device_probe drivers/pci/pci-driver.c:455 [inline] pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489
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
- 0.21 %
- Percentil entre todas las CVEs puntuadas
- 10
- Fecha de la puntuación
- 20/10/2026
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 7 referencias
- https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9
- https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7
- https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382
- https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368
- https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc
- https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061
- https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98640",
"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": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "92bf2883da0306ab9d1eb794acd1058fc5088ebc",
"versionType": "git"
},
{
"status": "affected",
"version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "7b3747d77767f066ccf4a9e8e3a8381643ab5368",
"versionType": "git"
},
{
"status": "affected",
"version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "5ff24aa7af0bca0780fe4e6effce902065f2c0a7",
"versionType": "git"
},
{
"status": "affected",
"version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "dc687489131559ee52f447592f6d039a5a013061",
"versionType": "git"
},
{
"status": "affected",
"version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "5f9e2ecb725adced013fbf5f94b9f185fad2e7d9",
"versionType": "git"
},
{
"status": "affected",
"version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "ee25833f037fa22d23ffdbfeebabe3579e8a0346",
"versionType": "git"
},
{
"status": "affected",
"version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
"lessThan": "65bcc5f89704efe5b9d69d4ea2c1002d90c31382",
"versionType": "git"
}
],
"programFiles": [
"drivers/hid/amd-sfh-hid/amd_sfh_common.h",
"drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.11",
"versionType": "semver"
},
{
"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": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/hid/amd-sfh-hid/amd_sfh_common.h",
"drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:17.123",
"references": [
{
"url": "https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: amd_sfh: Validate PCI BAR size before mapping\n\nThe amd_sfh driver maps PCI BAR 2 using pcim_iomap_regions() and\nsubsequently accesses MMIO registers at offsets up to 0x10958 (e.g.,\nAMD_P2C_MSG3 at 0x1068C). However, the driver never validates that the BAR\nsize is large enough to cover these accesses. If the driver is bound to a\ndevice with a smaller BAR 2, this leads to an out-of-bounds memory access\nand a page fault during the probe function.\n\nFor example, a page fault can occur when reading from privdata->mmio +\nAMD_P2C_MSG3 in mp2_select_ops():\n\n BUG: unable to handle page fault for address: ffffc9000390368c\n PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 105b64067 PTE 0\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]\n RIP: 0010:mp2_select_ops drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:282\n [inline]\n RIP: 0010:amd_mp2_pci_probe+0x337/0x5f0\n drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:487\n Call Trace:\n <TASK>\n local_pci_probe drivers/pci/pci-driver.c:332 [inline]\n pci_call_probe drivers/pci/pci-driver.c:394 [inline]\n __pci_device_probe drivers/pci/pci-driver.c:455 [inline]\n pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489\n\nFix this by verifying that the length of BAR 2 is at least 128KB before\nattempting to map it. Since the maximum accessed offset is 0x10958, and PCI\nBAR sizes are powers of 2, any legitimate hardware will have a BAR size of\nat least 128KB."
}
],
"lastModified": "2026-10-19T10:19:28.220",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}