{"id":"CVE-2026-89569","revision":"ade8a55710da4b4f83a7078b035eddb1","records":[{"revision":"ade8a55710da4b4f83a7078b035eddb1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89569","aliases":[],"title":"Bluetooth: RFCOMM: serialize security confirmation handling","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: serialize security confirmation handling\n\nrfcomm_security_cfm() looks up a session on session_list and then walks\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\nconcurrently:\n\n  hci_rx_work                    krfcommd\n  -----------                    ---------\n  rfcomm_session_get()\n                                 rfcomm_lock()\n                                 rfcomm_session_close()\n                                   rfcomm_dlc_unlink()\n                                   rfcomm_session_del()\n                                     kfree(s)\n                                 rfcomm_unlock()\n  walk s->dlcs\n\nThe callback can then read a freed session list head and touch freed DLCs\nwhile updating their flags or timers.\n\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\nfrom tearing the objects down while the callback is using them.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\n  Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\n  Workqueue: hci0 hci_rx_work\n  Call Trace:\n   rfcomm_security_cfm+0x41c/0x440\n   hci_encrypt_cfm+0x139/0x590\n   hci_encrypt_change_evt+0x37b/0xc40\n   hci_event_packet+0x71b/0xb20\n   hci_rx_work+0x293/0x730\n  Allocated by task 69:\n   rfcomm_session_add+0x9e/0x2f0\n   rfcomm_run+0x44b/0x41e0\n  Freed by task 69:\n   kfree+0x131/0x3c0\n   rfcomm_session_del+0x188/0x220\n   rfcomm_run+0x1985/0x41e0","state":0,"publishedAt":"2026-09-11T19:44:38.838+00:00","modifiedAt":"2026-10-19T08:49:02.628+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/rfcomm/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"62ce8b33eb238cf18c15207332fbdc26d858f592\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"3873f3449701b3dc98cba577923be6493598e7a1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"7ded3264106418c6456ccceaafd9fda596ce12c3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"82425b14f0fb22e46cfddc56d6465570f5ed0ce6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"1b7841ffad08e911e8c4b9470f3fa08423568940\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"946d76db77ee5f922968ce558629ae47b381e3fc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"fbf7961964a6e93360179f64712320ae9a1e9577\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\",\n                            \"lessThan\": \"759c185d0bbdb131357408f50b8735e04ed3caff\",\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/rfcomm/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592","https://git.kernel.org/stable/c/3873f3449701b3dc98cba577923be6493598e7a1","https://git.kernel.org/stable/c/7ded3264106418c6456ccceaafd9fda596ce12c3","https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6","https://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940","https://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc","https://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577","https://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89569","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89569","identifiers":["CVE-2026-89569"]},"retained":false,"historicalAffected":[]}],"coverage":[]}