{"id":"CVE-2026-63976","revision":"70839fcbdf7e4ee9a6a5c25ccae5e7a5","records":[{"revision":"70839fcbdf7e4ee9a6a5c25ccae5e7a5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63976","aliases":[],"title":"Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: clear chan->ident on ECRED reconfiguration success\n\nl2cap_ecred_reconf_rsp() returns early on success without clearing\nchan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp,\nl2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a\nsuccessful transaction to prevent the channel from matching subsequent\nresponses with the recycled ident value.\n\nA remote attacker that completed a reconfiguration as the peer can\nreplay a failure response with the stale ident, causing the kernel to\nmatch and destroy the already-established channel via\nl2cap_chan_del(chan, ECONNRESET).\n\nClear chan->ident for all matching channels on success, and harden the\nfailure path by using l2cap_chan_hold_unless_zero() consistent with\nother L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).","state":0,"publishedAt":"2026-07-19T14:56:01.284+00:00","modifiedAt":"2026-10-19T20:17:59.859+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\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"59f5ecf6ad5c4db6ae81965a96156954a3b0d89a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"ae0152d77d101c920769934fb102b18de0c6f526\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"c2afd2613fda90107c5e2fe8e855627451749c78\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"cc2b4f749de09975bfa06e58bbbad2f6acd4c79c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"3b5b5f423b4fd23404a393bda8adba3cd6f74ef1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"f39049304ba655ffcbb92edbdf8c51a1f1210bed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"8e7977afaef37c6bd2b2654f1bce6ab40d471147\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n                            \"lessThan\": \"00e1950716c6ed67d74777b2db286b0fa23b4be9\",\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\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.259\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.35\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.12\",\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: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/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a","https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526","https://git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78","https://git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c","https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1","https://git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed","https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147","https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63976","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63976","identifiers":["CVE-2026-63976"]},"retained":false,"historicalAffected":[]}],"coverage":[]}