{"id":"CVE-2026-74534","revision":"212293969be0496e9e68bb9c6a81e17b","records":[{"revision":"212293969be0496e9e68bb9c6a81e17b","observedAt":"2026-10-23T16:01:20.601+00:00","statement":{"source":"cve-program","id":"CVE-2026-74534","aliases":[],"title":"Bluetooth: ISO: fix refcounting of iso_conn","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix refcounting of iso_conn\n\niso_conn_del() and iso_chan_del() have a race that results to double-put\nof iso_conn:\n\n    [Task hdev->workqueue]         [Task 2]\n    iso_conn_del                   iso_chan_del\n      iso_conn_hold_unless_zero      iso_conn_lock\n      iso_conn_lock                  conn->sk = NULL\n                                     iso_conn_unlock\n      sk = iso_sock_hold(conn)  <---------´\n      if (!sk) iso_conn_put          iso_conn_put\n      iso_conn_put /* UAF */\n\nThe extra put for !sk in iso_conn_del() is currently required since\nfailing iso_chan_add() may leave iso_conn not associated with any sk.\n\nFix by having iso_pi(sk)->conn own refcount when non-NULL, so\niso_conn_del does not need to put it.  Adjust the iso_conn_add()\nrefcounting so that conn is put if it does not get associated with an\nsk.","state":0,"publishedAt":"2026-08-15T12:27:47.831+00:00","modifiedAt":"2026-10-23T08:20:16.546+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/iso.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a58d0f5dac322e16cc75334d000666512341bde5\",\n                            \"lessThan\": \"42c8bd6ac81e21200bb90f1eaf43d19352eec6d7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dc26097bdb864a0d5955b9a25e43376ffc1af99b\",\n                            \"lessThan\": \"3b921533e8aa95b77aadcf31737595578e735f3c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dc26097bdb864a0d5955b9a25e43376ffc1af99b\",\n                            \"lessThan\": \"8208b4939afb0a1977fffe902c3ca42fe0f3baaa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dc26097bdb864a0d5955b9a25e43376ffc1af99b\",\n                            \"lessThan\": \"fdfde532ab1caa165fcd8985001157ac8b4db365\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f53e7489273dc2bb307bf50f319b3762d45534f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.12.2\",\n                            \"lessThan\": \"6.12.113\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.11.11\",\n                            \"lessThan\": \"6.12\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/iso.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.113\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.8\",\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: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/42c8bd6ac81e21200bb90f1eaf43d19352eec6d7","https://git.kernel.org/stable/c/3b921533e8aa95b77aadcf31737595578e735f3c","https://git.kernel.org/stable/c/8208b4939afb0a1977fffe902c3ca42fe0f3baaa","https://git.kernel.org/stable/c/fdfde532ab1caa165fcd8985001157ac8b4db365"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74534","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74534","identifiers":["CVE-2026-74534"]},"retained":false,"historicalAffected":[]}],"coverage":[]}