CVE-2026-63976

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-63976

Key Details

CVE	CVE-2026-63976
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is adjacent; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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). (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-63976
CVE	https://www.cve.org/CVERecord?id=CVE-2026-63976

Source

Reference

NVD

CVE