{"id":"CVE-2026-68394","title":"Bluetooth: MGMT: revalidate LOAD_CONN_PARAM queued update","summary":"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 centr…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < 65ce6fe1b92112ba9064ded932c03180da3dd230","Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < 57059ff14d81df4a970b2ea8d8f54431bb91a025","Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa","Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < 2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e","Linux 6.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:48:01.240631Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:11.436Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68394","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"}],"tags":["cve.org"],"epss":0.00125,"epssPercentile":0.01986,"ingestedAt":"2026-10-16T17:24:46.863Z","slug":"CVE-2026-68394","body":"## Overview\n\nIn 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]\n\n## Affected\n\n- `Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < 65ce6fe1b92112ba9064ded932c03180da3dd230`\n- `Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < 57059ff14d81df4a970b2ea8d8f54431bb91a025`\n- `Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < b82802b5ab26a7c69fc2e7a0f2baa3c13a6c21aa`\n- `Linux >= 0ece498c27d8cd2fdad6f49a6abc34b8badd8fbc < 2bf282f8f715f5d05d6f4c49ffb3bd241c5e667e`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}