CVE-2026-93238
In the Linux kernel, the following vulnerability has been resolved:
s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap
The DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap on the stack without zero-initializing it.
In vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function is only called to initialize and populate apm_filtered if either filter_adapters or filter_domains is true. If the hot plug configuration change only adds control domains (meaning filter_cdoms is true, but filter_adapters and filter_domains are both false), vfio_ap_mdev_filter_matrix() is bypassed.
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Consequently, apm_filtered is passed to reset_queues_for_apids() with uninitialized stack garbage. This can cause reset_queues_for_apids() to interpret arbitrary stack garbage bits as valid APIDs to reset, potentially performing unintended guest hardware queue resets.
Fix this by zero-initializing the apm_filtered bitmap at the beginning of vfio_ap_mdev_hot_plug_cfg() using bitmap_zero().
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: 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/09548edc6114f1eb1035b30795e893204ef45b85
- https://git.kernel.org/stable/c/4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2
- https://git.kernel.org/stable/c/6d554f2571e6b4db242593ba561efd6a6d1f99a9
- https://git.kernel.org/stable/c/bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7
- https://git.kernel.org/stable/c/f73db632524320d2b93bc8534be8ea875053502d
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-93238",
"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": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "f73db632524320d2b93bc8534be8ea875053502d",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
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"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "09548edc6114f1eb1035b30795e893204ef45b85",
"versionType": "git"
},
{
"status": "affected",
"version": "eeb386aeb5b7c8d2dae6a3ba49255d8a97803182",
"lessThan": "bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/crypto/vfio_ap_ops.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/s390/crypto/vfio_ap_ops.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-24T16:17:19.563",
"references": [
{
"url": "https://git.kernel.org/stable/c/09548edc6114f1eb1035b30795e893204ef45b85",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4ba8a08f5f26ed59f356a6318bca3aa7cc0af3e2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6d554f2571e6b4db242593ba561efd6a6d1f99a9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bf09b9d7cd7890bc3a3b7eb63d5ece15f88bfde7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f73db632524320d2b93bc8534be8ea875053502d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap\n\nThe DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap\non the stack without zero-initializing it.\n\nIn vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function\nis only called to initialize and populate apm_filtered if either\nfilter_adapters or filter_domains is true. If the hot plug configuration\nchange only adds control domains (meaning filter_cdoms is true, but\nfilter_adapters and filter_domains are both false),\nvfio_ap_mdev_filter_matrix() is bypassed.\n\nConsequently, apm_filtered is passed to reset_queues_for_apids() with\nuninitialized stack garbage. This can cause reset_queues_for_apids() to\ninterpret arbitrary stack garbage bits as valid APIDs to reset, potentially\nperforming unintended guest hardware queue resets.\n\nFix this by zero-initializing the apm_filtered bitmap at the beginning of\nvfio_ap_mdev_hot_plug_cfg() using bitmap_zero()."
}
],
"lastModified": "2026-09-24T16:17:19.563",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}