Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-63946

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: ISO: fix UAF in iso_recv_frame<br /> <br /> iso_recv_frame reads conn-&gt;sk under iso_conn_lock but releases the lock<br /> before using sk, with no reference held. A concurrent iso_sock_kill()<br /> can free sk in that window, causing use-after-free on sk-&gt;sk_state and<br /> sock_queue_rcv_skb().<br /> <br /> Fix by replacing the bare pointer read with iso_sock_hold(conn), which<br /> calls sock_hold() while the spinlock is held, atomically elevating the<br /> refcount before the lock drops. Add a drop_put label so sock_put() is<br /> called on all exit paths where the hold succeeded.

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