CVE-2026-90187
In the Linux kernel, the following vulnerability has been resolved:
null_blk: free zones array on device power-off
null_init_zoned_dev() allocates dev->zones when a zoned device is powered on, but null_del_dev() never frees it on power-off; dev->zones is only freed later in null_free_dev(), when the configfs directory is removed. If the device is powered off and then on again, null_init_zoned_dev() allocates a new array and overwrites the dev->zones pointer, leaking the previous allocation each power cycle.
Free dev->zones in null_del_dev() via null_free_zoned_dev() to solve it. And calling null_free_zoned_dev() in null_free_dev() is no longer necessary because every caller already invokes null_del_dev() first: via nullb_group_drop_item() before nullb_device_release(), in the null_add_dev() error path of null_create_dev(), and in null_destroy_dev(). Remove the redundant call.
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And take &lock around zone_cond_store() in the two store wrappers to serialize dev->zones check-and-deref against its alloc/free, which already run under &lock. The reason there was no problem before is that only nullb_device_release() or null_exit() frees the dev->zones, which guarantees that subsequent users won't access the configfs interface.
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
JSON original (NVD)
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{
"id": "CVE-2026-90187",
"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": "ca4b2a011948fae4e4d31490107db4926385a983",
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{
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"versionType": "git"
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{
"status": "affected",
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"lessThan": "2a6357a9b935a34f5508618fee8a7fffbf7722a8",
"versionType": "git"
}
],
"programFiles": [
"drivers/block/null_blk/main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/block/null_blk/main.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-17T17:17:13.270",
"references": [
{
"url": "https://git.kernel.org/stable/c/056be41932c95aabdb3c2967d1ef4978f17a0225",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/0a3afab87124171022fb3579502fa38ef5b311c9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2a6357a9b935a34f5508618fee8a7fffbf7722a8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b2437d37fcc31fce8a5da1cc1739e284814d2491",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: free zones array on device power-off\n\nnull_init_zoned_dev() allocates dev->zones when a zoned device is powered\non, but null_del_dev() never frees it on power-off; dev->zones is only\nfreed later in null_free_dev(), when the configfs directory is removed. If\nthe device is powered off and then on again, null_init_zoned_dev()\nallocates a new array and overwrites the dev->zones pointer, leaking the\nprevious allocation each power cycle.\n\nFree dev->zones in null_del_dev() via null_free_zoned_dev() to solve it.\nAnd calling null_free_zoned_dev() in null_free_dev() is no longer necessary\nbecause every caller already invokes null_del_dev() first: via\nnullb_group_drop_item() before nullb_device_release(), in the\nnull_add_dev() error path of null_create_dev(), and in null_destroy_dev().\nRemove the redundant call.\n\nAnd take &lock around zone_cond_store() in the two store wrappers to\nserialize dev->zones check-and-deref against its alloc/free, which already\nrun under &lock. The reason there was no problem before is that only\nnullb_device_release() or null_exit() frees the dev->zones, which\nguarantees that subsequent users won't access the configfs interface."
}
],
"lastModified": "2026-09-17T17:17:13.270",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}