High 8.8Published Jul 19, 2026

CVE-2026-63946Bluetooth: ISO: fix UAF in iso_recv_frame

Updated under an hour ago (Oct 28, 2026, 11:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Awaiting Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ccf74f2390d60a2f9a75ef496d2564abb478f46a before c57ea90f203c8b8b41a474f19a09000d0f841436; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before 119fb6f80c44dc1c65d604cf28e64c56bd9b6568; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before b04ec131325baf4ea4577d6c6e6b86cf092e3731; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before c318aa51830a3d2cc1229968fe521441c97356cd; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before 47f23a259517abbdb8032c057a1e8a6bf3734878	CNA record

References

References

https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436
https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568
https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731
https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd
https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.