{"id":"CVE-2026-46111","revision":"4630d01ceae147679060120219daa67b","records":[{"revision":"4630d01ceae147679060120219daa67b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46111","aliases":[],"title":"Bluetooth: hci_conn: fix potential UAF in create_big_sync","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in create_big_sync\n\nAdd hci_conn_valid() check in create_big_sync() to detect stale\nconnections before proceeding with BIG creation. Handle the\nresulting -ECANCELED in create_big_complete() and re-validate the\nconnection under hci_dev_lock() before dereferencing, matching the\npattern used by create_le_conn_complete() and create_pa_complete().\n\nKeep the hci_conn object alive across the async boundary by taking\na reference via hci_conn_get() when queueing create_big_sync(), and\ndropping it in the completion callback. The refcount and the lock\nare complementary: the refcount keeps the object allocated, while\nhci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on\nhdev->conn_hash, as required by hci_conn_del().\n\nhci_conn_put() is called outside hci_dev_unlock() so the final put\n(which resolves to kfree() via bt_link_release) does not run under\nhdev->lock, though the release path would be safe either way.\n\nWithout this, create_big_complete() would unconditionally\ndereference the conn pointer on error, causing a use-after-free\nvia hci_connect_cfm() and hci_conn_del().","state":0,"publishedAt":"2026-05-28T09:35:19.97+00:00","modifiedAt":"2026-10-19T19:26:43.906+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/hci_conn.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"eca0ae4aea66914515e5e3098ea051b518ee5316\",\n                            \"lessThan\": \"d41093723e47255d7d74df86e2736711c1b8486e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eca0ae4aea66914515e5e3098ea051b518ee5316\",\n                            \"lessThan\": \"6823f730bf195fc296d9edd09e2ca94bc1ff5584\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eca0ae4aea66914515e5e3098ea051b518ee5316\",\n                            \"lessThan\": \"1750a2df0eab61dc421a7afae74abdd239a44b85\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eca0ae4aea66914515e5e3098ea051b518ee5316\",\n                            \"lessThan\": \"dc34f8d8240f25dd137dc2758ebbcc75e3779142\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eca0ae4aea66914515e5e3098ea051b518ee5316\",\n                            \"lessThan\": \"f8eaf92c57ad99358dd372580d5ff87623343a72\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eca0ae4aea66914515e5e3098ea051b518ee5316\",\n                            \"lessThan\": \"0beddb0c380bed5f5b8e61ddbe14635bb73d0b41\",\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/hci_conn.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.140\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.90\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.32\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.7\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\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/d41093723e47255d7d74df86e2736711c1b8486e","https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584","https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85","https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142","https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72","https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46111","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46111","identifiers":["CVE-2026-46111"]},"retained":false,"historicalAffected":[]}],"coverage":[]}