{"id":"CVE-2026-63976","title":"Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success","summary":"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 …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 59f5ecf6ad5c4db6ae81965a96156954a3b0d89a","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < ae0152d77d101c920769934fb102b18de0c6f526","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < c2afd2613fda90107c5e2fe8e855627451749c78","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < cc2b4f749de09975bfa06e58bbbad2f6acd4c79c","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 3b5b5f423b4fd23404a393bda8adba3cd6f74ef1","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < f39049304ba655ffcbb92edbdf8c51a1f1210bed","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 8e7977afaef37c6bd2b2654f1bce6ab40d471147","Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 00e1950716c6ed67d74777b2db286b0fa23b4be9","Linux 5.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:34:26.280157Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:15.571Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63976","references":[{"url":"https://git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a"},{"url":"https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526"},{"url":"https://git.kernel.org/stable/c/c2afd2613fda90107c5e2fe8e855627451749c78"},{"url":"https://git.kernel.org/stable/c/cc2b4f749de09975bfa06e58bbbad2f6acd4c79c"},{"url":"https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1"},{"url":"https://git.kernel.org/stable/c/f39049304ba655ffcbb92edbdf8c51a1f1210bed"},{"url":"https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147"},{"url":"https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9"}],"tags":["cve.org"],"epss":0.00456,"epssPercentile":0.38102,"ingestedAt":"2026-10-16T17:24:46.786Z","slug":"CVE-2026-63976","body":"## Overview\n\nIn 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).\n\n## Affected\n\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 59f5ecf6ad5c4db6ae81965a96156954a3b0d89a`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < ae0152d77d101c920769934fb102b18de0c6f526`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < c2afd2613fda90107c5e2fe8e855627451749c78`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < cc2b4f749de09975bfa06e58bbbad2f6acd4c79c`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 3b5b5f423b4fd23404a393bda8adba3cd6f74ef1`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < f39049304ba655ffcbb92edbdf8c51a1f1210bed`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 8e7977afaef37c6bd2b2654f1bce6ab40d471147`\n- `Linux >= 15f02b91056253e8cdc592888f431da0731337b8 < 00e1950716c6ed67d74777b2db286b0fa23b4be9`\n- `Linux 5.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}