{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38303", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.002Z", "datePublished": "2025-07-10T07:42:14.728Z", "dateUpdated": "2026-08-05T12:01:04.412Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:01:04.412Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: eir: Fix possible crashes on eir_create_adv_data\n\neir_create_adv_data may attempt to add EIR_FLAGS and EIR_TX_POWER\nwithout checking if that would fit." } ], "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 overflow is driven entirely by locally-configured advertising data submitted over an AF_BLUETOOTH HCI control socket (MGMT_OP_ADD_ADVERTISING / MGMT_OP_ADD_EXT_ADV_DATA), so local system access is mandatory. No adjacent or remote Bluetooth peer supplies any of the data consumed by eir_create_adv_data(), since advertising payloads are outbound and locally authored.\nAC:L - The attacker deterministically controls every input to the overflow — the adv instance flags (MGMT_ADV_FLAG_TX_POWER without a managed-flags bit), the exact adv_data_len at the tlv_data_max_len ceiling, and the BR/EDR-disabled state (MGMT_OP_SET_BREDR) that makes the kernel prepend the unbudgeted LE_AD_NO_BREDR Flags AD. There is no race, no timing window, and no memory-layout precondition outside the attacker's influence.\nPR:L - The handlers lack HCI_MGMT_UNTRUSTED so the socket must be CAP_NET_ADMIN-trusted, but in the realistic Bluetooth deployments for this code (Android's non-root AID_BLUETOOTH service, ChromeOS/embedded/automotive BT daemons) that capability is held by an unprivileged, remotely-exposed, SELinux-confined daemon rather than by root. A compromised Bluetooth daemon — far short of full admin — is sufficient to reach the bug.\nUI:N - The attacker issues every mgmt command needed (set bredr off, add advertising with a max-length payload) from its own socket, and the overflow fires from the hci_cmd_sync_work kthread without any victim action. No pairing, connection, or user-initiated operation by another party is involved.\nS:U - The corruption occurs on the kernel stack of the Bluetooth command-sync worker, within the same kernel security authority as the vulnerable code. No VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - In the extended-advertising path the inflated return value propagates into struct_size(pdu, data, len), so the HCI command skb is assembled from bytes beyond the 255-byte stack object, leaking adjacent kernel stack contents into the HCI command stream and to HCI monitor consumers; the legacy path similarly publishes hdev->adv_data_len = 34 with only 31 valid bytes. Combined with the stack-corruption primitive, this is leverageable for kernel memory disclosure.\nI:H - This is an out-of-bounds write past a fixed-size stack buffer, placing attacker-influenced bytes (0x02, EIR_TX_POWER, and a tx_power value the attacker can steer via the advertising parameters) into adjacent stack storage of the hci_cmd_sync_work frame. Per the OOB-write classification this is a control-flow-relevant corruption primitive, not a mere bad read.\nA:H - The commit is titled \"Fix possible crashes\" and the confirmed KASAN report on this code shows stack-out-of-bounds writes in eir_create_adv_data() from hci_cmd_sync_work. On stack-protector kernels overwriting past the buffer trips __stack_chk_fail and panics the machine; otherwise it oopses or corrupts the worker's frame, taking down the Bluetooth subsystem or the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/eir.c", "net/bluetooth/eir.h", "net/bluetooth/hci_sync.c" ], "versions": [ { "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1", "lessThan": "2d4588f55cc10fc228f3b46469dbfb3f0a8b13c8", "status": "affected", "versionType": "git" }, { "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1", "lessThan": "2af40d795d3fb0ee5c074b7ac56ab22402aa6e4f", "status": "affected", "versionType": "git" }, { "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1", "lessThan": "b9db0c27e73b7c8a19384a44af527edfda74ff3d", "status": "affected", "versionType": "git" }, { "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1", "lessThan": "47c03902269aff377f959dc3fd94a9733aa31d6e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/eir.c", "net/bluetooth/eir.h", "net/bluetooth/hci_sync.c" ], "versions": [ { "version": "5.16", "status": "affected" }, { "version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "5.16", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2d4588f55cc10fc228f3b46469dbfb3f0a8b13c8" }, { "url": "https://git.kernel.org/stable/c/2af40d795d3fb0ee5c074b7ac56ab22402aa6e4f" }, { "url": "https://git.kernel.org/stable/c/b9db0c27e73b7c8a19384a44af527edfda74ff3d" }, { "url": "https://git.kernel.org/stable/c/47c03902269aff377f959dc3fd94a9733aa31d6e" } ], "title": "Bluetooth: eir: Fix possible crashes on eir_create_adv_data", "x_generator": { "engine": "bippy-1.2.0" } } } }