{"id":"CVE-2026-74540","revision":"d9d02bbd16e146078dff55a1f0a9b59e","records":[{"revision":"d9d02bbd16e146078dff55a1f0a9b59e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74540","aliases":[],"title":"Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp\n\nl2cap_le_connect_rsp() obtains a channel via\n__l2cap_get_chan_by_ident() but neither holds a reference nor uses\nl2cap_chan_hold_unless_zero() before locking and operating on it.\nA concurrent l2cap_chan_del() triggered by a remote disconnect can\nfree the channel between the lookup and l2cap_chan_lock(), causing\na use-after-free.\n\nThe BR/EDR counterpart l2cap_connect_rsp() and the sibling handler\nl2cap_le_command_rej() already use l2cap_chan_hold_unless_zero()\nto safely hold a reference, but l2cap_le_connect_rsp() was left\nunprotected.\n\nFix by adding l2cap_chan_hold_unless_zero() after the ident lookup\nand l2cap_chan_put() on the exit path, consistent with other L2CAP\nresponse handlers.","state":0,"publishedAt":"2026-08-15T12:27:51.522+00:00","modifiedAt":"2026-10-16T19:05:54.604+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/l2cap_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"15d6c2367217a6a20b1abae9f38ded716bf620f1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"1818180fe12d6cec7a437bc59cde8efdf6b10250\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"8325eafb38c3dee5af329266393763693d17381b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"fd4c1e301bdec60a40728ea37de531cbccda501a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"522b730c62c53a1981604fd73524697fd347830d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"09f447accc2570751e7d17f0dc0788b40d3edade\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f1496dee9cbde2a62821f4441dadb0d3360f60c3\",\n                            \"lessThan\": \"c4740e7f23ff9a8210198d8b4703259e21b9f69d\",\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/l2cap_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\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\": \"6.6.151\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.103\",\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/15d6c2367217a6a20b1abae9f38ded716bf620f1","https://git.kernel.org/stable/c/1818180fe12d6cec7a437bc59cde8efdf6b10250","https://git.kernel.org/stable/c/8325eafb38c3dee5af329266393763693d17381b","https://git.kernel.org/stable/c/fd4c1e301bdec60a40728ea37de531cbccda501a","https://git.kernel.org/stable/c/522b730c62c53a1981604fd73524697fd347830d","https://git.kernel.org/stable/c/58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136","https://git.kernel.org/stable/c/09f447accc2570751e7d17f0dc0788b40d3edade","https://git.kernel.org/stable/c/c4740e7f23ff9a8210198d8b4703259e21b9f69d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74540","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74540","identifiers":["CVE-2026-74540"]},"retained":false,"historicalAffected":[]}],"coverage":[]}