High 8.8Published Jul 19, 2026

CVE-2026-63976Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success

Updated under an hour ago (Oct 28, 2026, 9:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success l2cap_ecred_reconf_rsp() returns early on success without clearing chan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp, l2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a successful transaction to prevent the channel from matching subsequent responses with the recycled ident value. A remote attacker that completed a reconfiguration as the peer can replay a failure response with the stale ident, causing the kernel to match and destroy the already-established channel via l2cap_chan_del(chan, ECONNRESET). Clear chan->ident for all matching channels on success, and harden the failure path by using l2cap_chan_hold_unless_zero() consistent with other L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-694
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Undergoing Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 15f02b91056253e8cdc592888f431da0731337b8 before 59f5ecf6ad5c4db6ae81965a96156954a3b0d89a; from 15f02b91056253e8cdc592888f431da0731337b8 before ae0152d77d101c920769934fb102b18de0c6f526; from 15f02b91056253e8cdc592888f431da0731337b8 before c2afd2613fda90107c5e2fe8e855627451749c78; from 15f02b91056253e8cdc592888f431da0731337b8 before cc2b4f749de09975bfa06e58bbbad2f6acd4c79c; 15f02b91056253e8cdc592888f431da0731337b8 builds before 3b5b5f423b4fd23404a393bda8adba3cd6f74ef1; from 15f02b91056253e8cdc592888f431da0731337b8 before f39049304ba655ffcbb92edbdf8c51a1f1210bed; 15f02b91056253e8cdc592888f431da0731337b8 builds before 8e7977afaef37c6bd2b2654f1bce6ab40d471147; 15f02b91056253e8cdc592888f431da0731337b8 builds before 00e1950716c6ed67d74777b2db286b0fa23b4be9	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.