Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-63975

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
19/07/2026
Last modified:
20/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp<br /> <br /> If dcid is received for an already-assigned destination CID the spec<br /> requires that both channels to be discarded, but calling l2cap_chan_del<br /> may invalidate the tmp cursor created by list_for_each_entry_safe and<br /> in fact it is the wrong procedure as the chan-&gt;dcid may be assigned<br /> previously it really needs to be disconnected.<br /> <br /> Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so<br /> instead schedule l2cap_chan_timeout with delay 0 to close the channel<br /> asynchronously.

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.80
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools