CVE-2026-63946

Bluetooth: ISO: fix UAF in iso_recv_frame

State: Published
Severity: 8.8 High
Published: Jul 19, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: fix UAF in iso_recv_frame

iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb().

Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	ccf74f2390d60a2f9a75ef496d2564abb478f46a to before c57ea90f203c8b8b41a474f19a09000d0f841436Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 119fb6f80c44dc1c65d604cf28e64c56bd9b6568Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before b04ec131325baf4ea4577d6c6e6b86cf092e3731Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before c318aa51830a3d2cc1229968fe521441c97356cdAffected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 47f23a259517abbdb8032c057a1e8a6bf3734878Affected
LinuxLinux	6.0Affected before 6.0Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.93 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.12 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

ccf74f2390d60a2f9a75ef496d2564abb478f46a to before c57ea90f203c8b8b41a474f19a09000d0f841436Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 119fb6f80c44dc1c65d604cf28e64c56bd9b6568Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before b04ec131325baf4ea4577d6c6e6b86cf092e3731Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before c318aa51830a3d2cc1229968fe521441c97356cdAffected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 47f23a259517abbdb8032c057a1e8a6bf3734878Affected

LinuxLinux

6.0Affected
before 6.0Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.93 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.12 through 7.0.*Not affected
7.1 and laterNot affected

References

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