CVE-2026-74274
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
cxl/region: Fill first free targets[] slot during auto-discovery
Any invalid endpoint decoder pointer in the target array of an active region is not allowed by cxl driver. This means cxl driver always assumes the first p->nr_targets entries of the target array in an auto-assembly region are valid. However, there are scenarios that could leave NULL endpoint decoder pointer holes in the target array.
To fix above issues, adjust cxl_region_attach_auto() logic to find the first free target slot for endpoint decoder attachment, this ensures NULL holes in the target array are filled, rather than adding new endpoint decoders at the tail of the target array.
Detalles técnicos trazas, registros y código del informe original
1. When cxl_cancel_auto_attach() removes an endpoint decoder from a
target array, the target slot is set to NULL. If the removed endpoint
decoder is not the last element in the target array, the target array
will contain a NULL hole.
2. When a auto-assembly region removes an assigned endpoint decoder, if
the removed endpoint decoder is not the last element in the target
array, always remains a NULL hole in the target array.
When a NULL pointer hole exists in a region's target array, it
introduces two potential problems:
1. Access an endpoint decoder via a NULL pointer. it always trigger
calltrace like that.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI
RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]
Call Trace:
<TASK>
cxl_region_attach+0xc50/0x2140 [cxl_core]
cxl_add_to_region+0x321/0x2330 [cxl_core]
discover_region+0x92/0x150 [cxl_port]
device_for_each_child+0xf3/0x170
cxl_port_probe+0x150/0x200 [cxl_port]
cxl_bus_probe+0x4f/0xa0 [cxl_core]
really_probe+0x1c8/0x960
__driver_probe_device+0x323/0x450
driver_probe_device+0x45/0x120
__device_attach_driver+0x15d/0x280
bus_for_each_drv+0x10f/0x190
2. Not having enough valid endpoint decoders attached to an
auto-assembly region. if an auto-assembly region is created with lock
flag or assigned endpoint decoder with lock flag, which means
assigned endpoint decoder will not be reset during detaching, they
could re-attach to the auto-assembly region again. But cxl region
driver relies on p->nr_targets to verify whether the required number
of endpoint decoders has been attached, and NULL endpoint decoder
pointers are still counted in that case.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: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- 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 (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-74274",
"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": "2230c4bdc4120417799c74326ade3123da226d54",
"lessThan": "6fde3fcdfec438ba0df26e25a8ac7c3707211799",
"versionType": "git"
},
{
"status": "affected",
"version": "2230c4bdc4120417799c74326ade3123da226d54",
"lessThan": "aa8a76711c15041ec1e42c3a74c15c2df0bd31f6",
"versionType": "git"
}
],
"programFiles": [
"drivers/cxl/core/region.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/cxl/core/region.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-15T06:22:26.793",
"references": [
{
"url": "https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fill first free targets[] slot during auto-discovery\n\nAny invalid endpoint decoder pointer in the target array of an active\nregion is not allowed by cxl driver. This means cxl driver always\nassumes the first p->nr_targets entries of the target array in an\nauto-assembly region are valid. However, there are scenarios that could\nleave NULL endpoint decoder pointer holes in the target array.\n\n1. When cxl_cancel_auto_attach() removes an endpoint decoder from a\n target array, the target slot is set to NULL. If the removed endpoint\n decoder is not the last element in the target array, the target array\n will contain a NULL hole.\n\n2. When a auto-assembly region removes an assigned endpoint decoder, if\n the removed endpoint decoder is not the last element in the target\n array, always remains a NULL hole in the target array.\n\nWhen a NULL pointer hole exists in a region's target array, it\nintroduces two potential problems:\n1. Access an endpoint decoder via a NULL pointer. it always trigger\n calltrace like that.\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI\n RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]\n Call Trace:\n <TASK>\n cxl_region_attach+0xc50/0x2140 [cxl_core]\n cxl_add_to_region+0x321/0x2330 [cxl_core]\n discover_region+0x92/0x150 [cxl_port]\n device_for_each_child+0xf3/0x170\n cxl_port_probe+0x150/0x200 [cxl_port]\n cxl_bus_probe+0x4f/0xa0 [cxl_core]\n really_probe+0x1c8/0x960\n __driver_probe_device+0x323/0x450\n driver_probe_device+0x45/0x120\n __device_attach_driver+0x15d/0x280\n bus_for_each_drv+0x10f/0x190\n\n2. Not having enough valid endpoint decoders attached to an\n auto-assembly region. if an auto-assembly region is created with lock\n flag or assigned endpoint decoder with lock flag, which means\n assigned endpoint decoder will not be reset during detaching, they\n could re-attach to the auto-assembly region again. But cxl region\n driver relies on p->nr_targets to verify whether the required number\n of endpoint decoders has been attached, and NULL endpoint decoder\n pointers are still counted in that case.\n\nTo fix above issues, adjust cxl_region_attach_auto() logic to find the\nfirst free target slot for endpoint decoder attachment, this ensures\nNULL holes in the target array are filled, rather than adding new\nendpoint decoders at the tail of the target array."
}
],
"lastModified": "2026-08-17T06:19:21.097",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}