CVE-2026-93081
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix SCMI device destroy lifetimes scmi_child_dev_find() drops the reference returned by device_find_child() before returning the scmi_device pointer. A concurrent unregister can then release the device while the destroy path is still using the returned pointer. Make the lookup helper return the device_find_child() reference and keep it until scmi_device_destroy() has finished unregistering the child. Also split device_unregister() in __scmi_device_destroy() so the SCMI bus ID is not made reusable until after device_del() has removed the old scmi_dev.N name from sysfs. This avoids a new SCMI device reusing the same ID while the old device is still registered. The final device release callback is also a possible cleanup path when SCMI children are deleted by driver core recursion rather than __scmi_device_destroy(). Release the SCMI bus ID from a common helper used by destroy, register-failure and final-release paths, and clear scmi_dev->id after freeing it so the final release cannot free the same ID again.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-17 17:18:02.063000
Last modified
2026-10-30 13:20:56.310000
View original CVE JSON
{
"id": "CVE-2026-93081",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-17T17:18:02.063",
"lastModified": "2026-10-30T13:20:56.310",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Fix SCMI device destroy lifetimes\n\nscmi_child_dev_find() drops the reference returned by\ndevice_find_child() before returning the scmi_device pointer. A\nconcurrent unregister can then release the device while the destroy path\nis still using the returned pointer.\n\nMake the lookup helper return the device_find_child() reference and keep\nit until scmi_device_destroy() has finished unregistering the child.\n\nAlso split device_unregister() in __scmi_device_destroy() so the SCMI bus\nID is not made reusable until after device_del() has removed the old\nscmi_dev.N name from sysfs. This avoids a new SCMI device reusing the\nsame ID while the old device is still registered.\n\nThe final device release callback is also a possible cleanup path when\nSCMI children are deleted by driver core recursion rather than\n__scmi_device_destroy(). Release the SCMI bus ID from a common helper\nused by destroy, register-failure and final-release paths, and clear\nscmi_dev->id after freeing it so the final release cannot free the same\nID again."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/firmware/arm_scmi/bus.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "ff4273d47da81b95ed9396110bcbd1b7b7470fe8",
"lessThan": "afe5c022a180e0ade394d3fffbafc1a701f50993",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "d8ecdceeb90cd2c265b222a7b65487faf68fea73",
"versionType": "git",
"status": "affected"
},
{
"version": "969d8beaa2e374387bf9aa5602ef84fc50bb48d8",
"lessThan": "916e27f71a80f6d77c48d1a1a5782d6d5ef9017c",
"versionType": "git",
"status": "affected"
},
{
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{
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"status": "affected"
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{
"version": "91ff1e9652fb9beb0174267d6bb38243dff211bb",
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"status": "affected"
},
{
"version": "8a8a3547d5c4960da053df49c75bf623827a25da",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "6.1.191",
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},
{
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"status": "affected"
},
{
"version": "6.12.28",
"lessThan": "6.12.114",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.15.182",
"lessThan": "5.16",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.14.6",
"lessThan": "6.15",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/firmware/arm_scmi/bus.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.15",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.15",
"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": "6.12.114",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.57",
"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/6abe8fe36b29ff51d1a42c2f338972883f4751a5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/916e27f71a80f6d77c48d1a1a5782d6d5ef9017c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a60bc2df2d323cc1342f0cf95563cae266801e20",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/afe5c022a180e0ade394d3fffbafc1a701f50993",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c59b3393df1348a12308aaabd5fbc58ed6b21cf5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d8ecdceeb90cd2c265b222a7b65487faf68fea73",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}