{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68394", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.389Z", "datePublished": "2026-08-10T12:04:13.562Z", "dateUpdated": "2026-10-16T15:53:11.436Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:04:42.328Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update\n\nMGMT_OP_LOAD_CONN_PARAM queues conn_update_sync() when a single parameter\nupdate changes an existing LE central connection. The queued work currently\nstores a borrowed hci_conn_params entry from hdev->le_conn_params. A later\nLOAD_CONN_PARAM request can clear disabled parameters and free that entry\nbefore hci_cmd_sync_work() runs the queued callback.\n\nDo not keep the borrowed hci_conn_params pointer in queued work. Queue the\nhci_conn instead and hold a reference until the queued callback completes.\nWhen the work runs, revalidate that the connection is still present, look\nup the current hci_conn_params entry, and cancel the update if userspace\nremoved that entry while the work was pending.\n\nCopy the interval values from the current params entry under hdev->lock,\nthen drop the lock and keep using hci_le_conn_update_sync() to issue the\nupdate.\n\nValidation reproduced this kernel report:\nBUG: KASAN: slab-use-after-free in conn_update_sync+0x2a/0xf0 [bluetooth]\nRead of size 1 at addr ffff88810c697126 by task kworker/u17:0/377\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\n\nCall Trace:\n \n dump_stack_lvl+0x66/0xa0\n print_report+0xce/0x5f0\n kasan_report+0xe0/0x110\n conn_update_sync+0x2a/0xf0 [bluetooth]\n hci_cmd_sync_work+0x187/0x210 [bluetooth]\n process_one_work+0x4fd/0xbc0\n worker_thread+0x2d8/0x570\n kthread+0x1ad/0x1f0\n ret_from_fork+0x3c9/0x540\n ret_from_fork_asm+0x1a/0x30\n\nAllocated by task 466:\n hci_conn_params_add+0xa6/0x240 [bluetooth]\n load_conn_param+0x4e1/0x850 [bluetooth]\n hci_sock_sendmsg+0x96b/0xf80 [bluetooth]\n\nFreed by task 474:\n kfree+0x313/0x590\n hci_conn_params_clear_disabled+0x9b/0xc0 [bluetooth]\n load_conn_param+0x4bf/0x850 [bluetooth]\n hci_sock_sendmsg+0x96b/0xf80 [bluetooth]" } ], "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 vulnerability is triggered entirely through local interfaces — two MGMT_OP_LOAD_CONN_PARAM commands written to a local AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, reaching load_conn_param() via hci_sock_sendmsg()/hci_mgmt_cmd(). No over-the-air interaction from a remote Bluetooth peer is required.\nAC:L - The attacker controls both sides of the race: it issues the LOAD_CONN_PARAM that queues conn_update_sync() and then immediately issues a second LOAD_CONN_PARAM whose hci_conn_params_clear_disabled() frees the borrowed entry before hci_cmd_sync_work() dequeues it, and it can grool the slab by repeated hci_conn_params_add() calls.\nPR:L - Reaching load_conn_param() needs a trusted MGMT socket (CAP_NET_ADMIN at bind), which is exactly the privilege held by the unprivileged Bluetooth service account on Android and desktop Linux (bluetoothd / com.android.bluetooth) — a low-privilege, externally exposed daemon, not real root, and the standard scoring for MGMT-socket flaws.\nUI:N - Exploitation requires only that the attacker send its own MGMT commands over an existing LE central connection it can itself establish; no action by any other user or victim application is needed.\nS:U - The use-after-free corrupts kernel slab memory and its impact stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free read: conn_update_sync() reads addr/addr_type and the four interval fields from a freed hci_conn_params and places them into the HCI_OP_LE_CONN_UPDATE command, leaking reallocated heap contents; more generally a UAF gives the attacker control over freed-object contents and can be leveraged into arbitrary kernel memory disclosure.\nI:H - The attacker grooms the freed hci_conn_params slot with controlled data, so freed memory dictates which connection is looked up and what parameters are programmed into the controller; a use-after-free of this kind is a standard primitive for heap manipulation and control-flow/data corruption in the kernel.\nA:H - The bug is a confirmed KASAN slab-use-after-free (BUG: KASAN: slab-use-after-free in conn_update_sync+0x2a/0xf0) in a workqueue context, which panics on KASAN/panic_on_warn kernels and readily causes oopses or unpredictable Bluetooth-stack state otherwise." } ] } ], "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": "0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc", "lessThan": "65ce6fe1b92112ba9064ded932c03180da3dd230", "status": "affected", "versionType": "git" }, { "version": "0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc", "lessThan": "57059ff14d81df4a970b2ea8d8f54431bb91a025", "status": "affected", "versionType": "git" }, { "version": "0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc", "lessThan": "b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa", "status": "affected", "versionType": "git" }, { "version": "0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc", "lessThan": "2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e", "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": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "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": "6.11", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/65ce6fe1b92112ba9064ded932c03180da3dd230" }, { "url": "https://git.kernel.org/stable/c/57059ff14d81df4a970b2ea8d8f54431bb91a025" }, { "url": "https://git.kernel.org/stable/c/b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa" }, { "url": "https://git.kernel.org/stable/c/2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e" } ], "title": "Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-68394", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:48:01.240631Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:11.436Z" } } ] } }