356 lines
17 KiB
JSON
356 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47500",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-22T06:20:56.204Z",
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"datePublished": "2024-05-24T15:01:43.362Z",
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"dateUpdated": "2026-08-05T08:48:07.024Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:48:07.024Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: mma8452: Fix trigger reference couting\n\nThe mma8452 driver directly assigns a trigger to the struct iio_dev. The\nIIO core when done using this trigger will call `iio_trigger_put()` to drop\nthe reference count by 1.\n\nWithout the matching `iio_trigger_get()` in the driver the reference count\ncan reach 0 too early, the trigger gets freed while still in use and a\nuse-after-free occurs.\n\nFix this by getting a reference to the trigger before assigning it to the\nIIO device."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached through the local IIO sysfs/chardev interface (writing trigger/current_trigger or device teardown) for an on-board I2C accelerometer driver, not via network packets or physical bus attachment.\nAC:L - An attacker with IIO access can deterministically trigger the unbalanced iio_trigger_put by clearing or changing current_trigger (buffer disabled) or by inducing consumer teardown; no attacker-uncontrollable race or layout is required.\nPR:L - Exploitation needs only ordinary local access to the IIO device/sysfs (commonly granted to sensor/iio groups on phones and embedded systems), not full root or init-namespace admin capabilities.\nUI:N - The attacker performs the sysfs write or teardown themselves; no separate victim action is required.\nS:U - The UAF corrupts kernel memory in the same privilege domain as the vulnerable driver and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - This is a use-after-free of struct iio_trigger; per kernel UAF guidance the attacker can reclaim the object and obtain arbitrary kernel read primitives.\nI:H - The freed trigger contains ops and related function pointers, so heap reuse enables arbitrary write / control-flow hijacking and potential code execution.\nA:H - Premature free of the still-registered trigger, or a subsequent NULL/invalid trigger poll from the IRQ path, can oops/panic the kernel."
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}
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]
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}
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