{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47500", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-22T06:20:56.204Z", "datePublished": "2024-05-24T15:01:43.362Z", "dateUpdated": "2026-08-05T08:48:07.024Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:07.024Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iio/accel/mma8452.c" ], "versions": [ { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "094d513b78b1714113bc016684b8142382e071ba", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "fb75cc4740d81264cd5bcb0e17d961d018a8be96", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "794c0898f6bf39a458655d5fb4af70ec43a5cfcb", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "f5deab10ced368c807866283f8b79144c4823be8", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "acf0088ac073ca6e7f4cad6acac112177e08df5e", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "db12d95085367de8b0223929d1332731024441f1", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "c43517071dfc9fce34f8f69dbb98a86017f6b739", "status": "affected", "versionType": "git" }, { "version": "ae6d9ce05691bf79694074db7c7da980080548af", "lessThan": "cd0082235783f814241a1c9483fb89e405f4f892", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iio/accel/mma8452.c" ], "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver" }, { "version": "4.4.295", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.293", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.258", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.221", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.165", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.85", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.8", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "4.4.295" }, { "vulnerable": true, "criteria": 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