CVE-2026-90187
Full vulnerability record from the local CVENow database.
Description
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. 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.
View original CVE JSON
{
"id": "CVE-2026-90187",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-17T17:17:13.270",
"lastModified": "2026-10-30T13:20:45.803",
"vulnStatus": "Received",
"cveTags": [],
"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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/block/null_blk/main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "ca4b2a011948fae4e4d31490107db4926385a983",
"lessThan": "26d21585caa61c30d0f3044a1e6d172456148c9f",
"versionType": "git",
"status": "affected"
},
{
"version": "ca4b2a011948fae4e4d31490107db4926385a983",
"lessThan": "08a31a2cc3d1cea67ccd292d01511cd0a72d4656",
"versionType": "git",
"status": "affected"
},
{
"version": "ca4b2a011948fae4e4d31490107db4926385a983",
"lessThan": "056be41932c95aabdb3c2967d1ef4978f17a0225",
"versionType": "git",
"status": "affected"
},
{
"version": "ca4b2a011948fae4e4d31490107db4926385a983",
"lessThan": "b2437d37fcc31fce8a5da1cc1739e284814d2491",
"versionType": "git",
"status": "affected"
},
{
"version": "ca4b2a011948fae4e4d31490107db4926385a983",
"lessThan": "0a3afab87124171022fb3579502fa38ef5b311c9",
"versionType": "git",
"status": "affected"
},
{
"version": "ca4b2a011948fae4e4d31490107db4926385a983",
"lessThan": "2a6357a9b935a34f5508618fee8a7fffbf7722a8",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/block/null_blk/main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "4.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.19",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.6",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/056be41932c95aabdb3c2967d1ef4978f17a0225",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/08a31a2cc3d1cea67ccd292d01511cd0a72d4656",
"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/26d21585caa61c30d0f3044a1e6d172456148c9f",
"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"
}
]
}