{"id":"CVE-2026-68394","revision":"4b62afaadf724d21ade73c8e5abd3b21","records":[{"revision":"4b62afaadf724d21ade73c8e5abd3b21","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68394","aliases":[],"title":"Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update","description":"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 <TASK>\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]","state":0,"publishedAt":"2026-08-10T12:04:13.562+00:00","modifiedAt":"2026-10-19T21:09:08.131+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/bluetooth/mgmt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\n                            \"lessThan\": \"65ce6fe1b92112ba9064ded932c03180da3dd230\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\n                            \"lessThan\": \"57059ff14d81df4a970b2ea8d8f54431bb91a025\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\n                            \"lessThan\": \"b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc\",\n                            \"lessThan\": \"2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/bluetooth/mgmt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.42\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.6\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/65ce6fe1b92112ba9064ded932c03180da3dd230","https://git.kernel.org/stable/c/57059ff14d81df4a970b2ea8d8f54431bb91a025","https://git.kernel.org/stable/c/b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa","https://git.kernel.org/stable/c/2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68394","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68394","identifiers":["CVE-2026-68394"]},"retained":false,"historicalAffected":[]}],"coverage":[]}