Vulnerability 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.
CVSS Score
HIGH
References
- https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568
- https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
- https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878
- https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731
- https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd
- https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436
FAQ
What is CVE-2026-63946?
CVE-2026-63946 is a vulnerability with a CVSS score of 8.8 (HIGH). 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,...
How severe is CVE-2026-63946?
CVE-2026-63946 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63946?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.