{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68391", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.388Z", "datePublished": "2026-08-10T12:04:10.564Z", "dateUpdated": "2026-10-16T15:53:11.128Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:55:46.244Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds\n\nDereferencing RCU-protected pointers outside critical sections is\ninvalid and may lead to UAF. Use of hci_conn in hci_sync callbacks also\nneeds to hold refcount to avoid UAF.\n\nTake appropriate locks for hci_conn lookups, and take refcount for\nhci_conn pointers stored in mgmt_pending_cmd so that the pointer stays\nvalid.\n\nWhen accessing conn->state, ensure hdev->lock is held to avoid data\nrace." } ], "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 - Both sides of the race are local: the vulnerable path is entered only by writing MGMT_OP_GET_CONN_INFO/MGMT_OP_GET_CLOCK_INFO to an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and the free is driven by a local disconnect/device-teardown. A remote or adjacent Bluetooth peer cannot inject mgmt commands, so the vector is local even though the subsystem is Bluetooth.\nAC:L - The attacker owns both sides of the race: one thread loops GET_CONN_INFO/GET_CLOCK_INFO, whose sync callback blocks in __hci_cmd_sync waiting on the controller for up to HCI_CMD_TIMEOUT, while another issues MGMT_OP_DISCONNECT or HCIDEVDOWN to free the hci_conn inside that wide window; with an emulated controller the response timing is fully controlled, and the sequence can be retried indefinitely.\nPR:L - The opcodes lack HCI_MGMT_UNTRUSTED so they need a trusted mgmt socket (CAP_NET_ADMIN), which kernel CNA practice for the Bluetooth mgmt interface treats as low privilege: it is a delegable capability held by the non-root bluetoothd service account and Android's sandboxed Bluetooth process rather than full init-namespace root.\nUI:N - The attacker performs every step itself — queueing the mgmt command and tearing down the connection or the HCI index — with no victim action, pairing, or user-initiated Bluetooth operation required.\nS:U - The use-after-free and the resulting heap corruption stay entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - get_conn_info_complete()/get_clock_info_complete() read rssi, tx_power, max_tx_power, clock and clock_accuracy from a freed hci_conn and return them to userspace over the mgmt socket; hci_conn comes from a general-purpose kmalloc cache, so grooming the reclaimed slab turns this into a repeatable kernel-memory disclosure oracle.\nI:H - The dangling cmd->user_data points at a freed, sprayable struct-device-embedded object that can be reclaimed with attacker-shaped data and is later put/released, and the unlocked lookup also propagates a stale conn->handle into hci_read_rssi_sync/hci_read_clock_sync so the host acts on a handle that may have been reused by another link — sufficient for controlled corruption after heap grooming.\nA:H - Dereferencing the freed hci_conn in the hci_cmd_sync completion callback is a slab use-after-free that produces a KASAN splat and can oops or panic the kernel when the slab has been returned to the page allocator, and it can be re-triggered in a loop for sustained denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/mgmt.c" ], "versions": [ { "version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a", "lessThan": "84674dd1d3192ecb050827d3148642609c0c9dbb", "status": "affected", "versionType": "git" }, { "version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a", "lessThan": "b56f2ecafc08f372bf0529f9c4f3f429cb1702dc", "status": "affected", "versionType": "git" }, { "version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a", "lessThan": "f915e74b6f18293d1d69a2a3305ef321ff7c0172", "status": "affected", "versionType": "git" }, { "version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a", "lessThan": "d5b3b484b62bb0f4542e7622789d28871626cdf0", "status": "affected", "versionType": "git" }, { "version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a", "lessThan": "ecdcb55ea1c01dda074406f38058785a69526734", "status": "affected", "versionType": "git" }, { "version": "7b445e220db9a2c58be5d09bbbd322abf1b1452a", "lessThan": "da55f570191d5d72f10c607a7043b947eb05ea46", "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/mgmt.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.0", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/84674dd1d3192ecb050827d3148642609c0c9dbb" }, { "url": "https://git.kernel.org/stable/c/b56f2ecafc08f372bf0529f9c4f3f429cb1702dc" }, { "url": "https://git.kernel.org/stable/c/f915e74b6f18293d1d69a2a3305ef321ff7c0172" }, { "url": "https://git.kernel.org/stable/c/d5b3b484b62bb0f4542e7622789d28871626cdf0" }, { "url": "https://git.kernel.org/stable/c/ecdcb55ea1c01dda074406f38058785a69526734" }, { "url": "https://git.kernel.org/stable/c/da55f570191d5d72f10c607a7043b947eb05ea46" } ], "title": "Bluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-68391", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:47:56.283760Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:11.128Z" } } ] } }