{"cve":"CVE-2026-63976","nvd":{"published":"2026-07-19T16:17:16.733","modified":"2026-10-19T21:17:15.263","status":"Undergoing Analysis","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).","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-694"],"references":["https://git.kernel.org/stable/c/00e1950716c6ed67d74777b2db286b0fa23b4be9","https://git.kernel.org/stable/c/3b5b5f423b4fd23404a393bda8adba3cd6f74ef1","https://git.kernel.org/stable/c/59f5ecf6ad5c4db6ae81965a96156954a3b0d89a","https://git.kernel.org/stable/c/8e7977afaef37c6bd2b2654f1bce6ab40d471147","https://git.kernel.org/stable/c/ae0152d77d101c920769934fb102b18de0c6f526"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-63976","score":0.00569,"percentile":0.46822,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}