CVE-2023-54137
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
vfio/type1: fix cap_migration information leak
Fix an information leak where an uninitialized hole in struct vfio_iommu_type1_info_cap_migration on the stack is exposed to userspace.
The definition of struct vfio_iommu_type1_info_cap_migration contains a hole as shown in this pahole(1) output:
The cap_mig variable is filled in without initializing the hole:
The structure is then copied to a temporary location on the heap. At this point it's already too late and ioctl(VFIO_IOMMU_GET_INFO) copies it to userspace later:
This issue was found by code inspection.
Detalles técnicos trazas, registros y código del informe original
struct vfio_iommu_type1_info_cap_migration {
struct vfio_info_cap_header header; /* 0 8 */
__u32 flags; /* 8 4 */
/* XXX 4 bytes hole, try to pack */
__u64 pgsize_bitmap; /* 16 8 */
__u64 max_dirty_bitmap_size; /* 24 8 */
/* size: 32, cachelines: 1, members: 4 */
/* sum members: 28, holes: 1, sum holes: 4 */
/* last cacheline: 32 bytes */
};
static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,
struct vfio_info_cap *caps)
{
struct vfio_iommu_type1_info_cap_migration cap_mig;
cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION;
cap_mig.header.version = 1;
cap_mig.flags = 0;
/* support minimum pgsize */
cap_mig.pgsize_bitmap = (size_t)1 << __ffs(iommu->pgsize_bitmap);
cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;
return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig));
}
int vfio_info_add_capability(struct vfio_info_cap *caps,
struct vfio_info_cap_header *cap, size_t size)
{
struct vfio_info_cap_header *header;
header = vfio_info_cap_add(caps, size, cap->id, cap->version);
if (IS_ERR(header))
return PTR_ERR(header);
memcpy(header + 1, cap + 1, size - sizeof(*header));
return 0;
}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: 11
- 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)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/13fd667db999bffb557c5de7adb3c14f1713dd51
- https://git.kernel.org/stable/c/1b5feb8497cdb5b9962db2700814bffbc030fb4a
- https://git.kernel.org/stable/c/ad83d83dd891244de0d07678b257dc976db7c132
- https://git.kernel.org/stable/c/cbac29a1caa49a34e131394e1f4d924a76d8b0c9
- https://git.kernel.org/stable/c/cd24e2a60af633f157d7e59c0a6dba64f131c0b1
- https://git.kernel.org/stable/c/f6f300ecc196d243c02adeb9ee0c62c677c24bfb
JSON original (NVD)
Mostrar
{
"id": "CVE-2023-54137",
"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": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
"lessThan": "ad83d83dd891244de0d07678b257dc976db7c132",
"versionType": "git"
},
{
"status": "affected",
"version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
"lessThan": "13fd667db999bffb557c5de7adb3c14f1713dd51",
"versionType": "git"
},
{
"status": "affected",
"version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
"lessThan": "f6f300ecc196d243c02adeb9ee0c62c677c24bfb",
"versionType": "git"
},
{
"status": "affected",
"version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
"lessThan": "cbac29a1caa49a34e131394e1f4d924a76d8b0c9",
"versionType": "git"
},
{
"status": "affected",
"version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
"lessThan": "1b5feb8497cdb5b9962db2700814bffbc030fb4a",
"versionType": "git"
},
{
"status": "affected",
"version": "ad721705d09c62f0d108a6b4f59867ebfd592c90",
"lessThan": "cd24e2a60af633f157d7e59c0a6dba64f131c0b1",
"versionType": "git"
}
],
"programFiles": [
"drivers/vfio/vfio_iommu_type1.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.195",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.132",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.53",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.4.16",
"versionType": "semver",
"lessThanOrEqual": "6.4.*"
},
{
"status": "unaffected",
"version": "6.5.3",
"versionType": "semver",
"lessThanOrEqual": "6.5.*"
},
{
"status": "unaffected",
"version": "6.6",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/vfio/vfio_iommu_type1.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-24T13:16:15.693",
"references": [
{
"url": "https://git.kernel.org/stable/c/13fd667db999bffb557c5de7adb3c14f1713dd51",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/1b5feb8497cdb5b9962db2700814bffbc030fb4a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ad83d83dd891244de0d07678b257dc976db7c132",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cbac29a1caa49a34e131394e1f4d924a76d8b0c9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cd24e2a60af633f157d7e59c0a6dba64f131c0b1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f6f300ecc196d243c02adeb9ee0c62c677c24bfb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/type1: fix cap_migration information leak\n\nFix an information leak where an uninitialized hole in struct\nvfio_iommu_type1_info_cap_migration on the stack is exposed to userspace.\n\nThe definition of struct vfio_iommu_type1_info_cap_migration contains a hole as\nshown in this pahole(1) output:\n\n struct vfio_iommu_type1_info_cap_migration {\n struct vfio_info_cap_header header; /* 0 8 */\n __u32 flags; /* 8 4 */\n\n /* XXX 4 bytes hole, try to pack */\n\n __u64 pgsize_bitmap; /* 16 8 */\n __u64 max_dirty_bitmap_size; /* 24 8 */\n\n /* size: 32, cachelines: 1, members: 4 */\n /* sum members: 28, holes: 1, sum holes: 4 */\n /* last cacheline: 32 bytes */\n };\n\nThe cap_mig variable is filled in without initializing the hole:\n\n static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,\n struct vfio_info_cap *caps)\n {\n struct vfio_iommu_type1_info_cap_migration cap_mig;\n\n cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION;\n cap_mig.header.version = 1;\n\n cap_mig.flags = 0;\n /* support minimum pgsize */\n cap_mig.pgsize_bitmap = (size_t)1 << __ffs(iommu->pgsize_bitmap);\n cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;\n\n return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig));\n }\n\nThe structure is then copied to a temporary location on the heap. At this point\nit's already too late and ioctl(VFIO_IOMMU_GET_INFO) copies it to userspace\nlater:\n\n int vfio_info_add_capability(struct vfio_info_cap *caps,\n struct vfio_info_cap_header *cap, size_t size)\n {\n struct vfio_info_cap_header *header;\n\n header = vfio_info_cap_add(caps, size, cap->id, cap->version);\n if (IS_ERR(header))\n return PTR_ERR(header);\n\n memcpy(header + 1, cap + 1, size - sizeof(*header));\n\n return 0;\n }\n\nThis issue was found by code inspection."
}
],
"lastModified": "2026-06-17T06:46:52.180",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}