{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47620", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-20T11:03:43.235Z", "datePublished": "2024-06-20T11:08:09.320Z", "dateUpdated": "2026-08-05T08:48:40.593Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:40.593Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: refactor malicious adv data check\n\nCheck for out-of-bound read was being performed at the end of while\nnum_reports loop, and would fill journal with false positives. Added\ncheck to beginning of loop processing so that it doesn't get checked\nafter ptr has been advanced." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The bug is in HCI LE Advertising Report parsing (hci_le_adv_report_evt), reached when a nearby BLE device’s advertisements are delivered by the controller as HCI events—the standard Adjacent Bluetooth path, not a host-local syscall-only interface.\nAC:L - A crafted advertising-report HCI event with num_reports/length inconsistent with the skb deterministically drives the loop into an out-of-bounds header read; the attacker controls the event contents (via RF advertising plus controller delivery, or an equivalent HCI source) with no uncontrollable race or rare layout dependency.\nPR:N - BLE advertising reports are processed without host authentication or local credentials; an unauthenticated adjacent Bluetooth peer needs no account or capability on the victim.\nUI:N - On typical phone/IoT deployments LE scanning runs in the background once Bluetooth is enabled, so reports are handled automatically with no extra victim action at exploit time.\nS:U - Impact is confined to the host kernel Bluetooth stack (slab over-read/possible oops) within the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - With the check only after ptr advances, the next iteration can read hci_ev_le_advertising_info fields past skb_tail into adjacent slab memory (KASAN slab-OOB read); per guidance such OOB reads are Confidentiality High.\nI:N - This is a read-only out-of-bounds access of report headers; process_adv_report is gated by the in-loop length/tail checks and there is no OOB write, UAF, or control-flow hijack primitive.\nA:H - Reading past the skb kmalloc object can fault on unmapped/guarded memory and oops the kernel (as in the syzbot KASAN report on this path), which is scored Availability High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_event.c" ], "versions": [ { "version": "048acfa4daf167b007b6bd8bef474e90c2282a5f", "lessThan": "305e92f525450f3e1b5f5c9dc7eadb152d66a082", "status": "affected", "versionType": "git" }, { "version": "7d4238edd3bf8b8c75571cc3b382bc10438ac588", "lessThan": "7889b38a7f21ed19314f83194622b195d328465c", "status": "affected", "versionType": "git" }, { "version": "185c77cbb53bc7481acc5a0b4e6119bbe393d561", "lessThan": "5a539c08d743d9910631448da78af5e961664c0e", "status": "affected", "versionType": "git" }, { "version": "4a1491432394b22e585a185ffca49086e4046aae", "lessThan": "8819f93cd4a443dfe547aa622b21f723757df3fb", "status": "affected", "versionType": "git" }, { "version": "24161b9c43de966789d5956428f45002d10f878e", "lessThan": "835d3706852537bf92eb23eb8635b8dee0c0aa67", "status": "affected", "versionType": "git" }, { "version": "ffc9019bd991707701273c2e5d8aed472229fc4d", "lessThan": "83d5196b65d1b29e27d7dd16a3b9b439fb1d2dba", "status": "affected", "versionType": "git" }, { "version": "2de0e6a71ceb056e17e4684dce8b7640367996f9", "lessThan": "bcea886771c3f22a590c8c8b9139a107bd7f1e1c", "status": "affected", "versionType": "git" }, { "version": "640a476e38fce6c70c738ac09e5167e34f570303", "lessThan": "5c968affa804ba98c3c603f37ffea6fba618025e", "status": "affected", "versionType": "git" }, { "version": "3a56ef719f0b9682afb8a86d64b2399e36faa4e6", "lessThan": "899663be5e75dc0174dc8bda0b5e6826edf0b29a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_event.c" ], "versions": [ { "version": "4.4.300", "lessThan": "4.4.302", "status": "affected", "versionType": "semver" }, { "version": "4.9.298", "lessThan": "4.9.300", "status": "affected", "versionType": "semver" }, { "version": "4.14.263", "lessThan": "4.14.265", "status": "affected", "versionType": "semver" }, { "version": "4.19.226", "lessThan": "4.19.228", "status": "affected", "versionType": "semver" }, { "version": "5.4.174", "lessThan": "5.4.176", "status": "affected", "versionType": "semver" }, { "version": "5.10.94", "lessThan": "5.10.96", "status": "affected", "versionType": "semver" }, { "version": "5.15.17", "lessThan": "5.15.19", "status": "affected", "versionType": "semver" }, { "version": "5.16.3", "lessThan": "5.16.5", "status": "affected", "versionType": "semver" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.300", "versionEndExcluding": 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