CVE-2026-63946
Last modified
CVE-2026-63946 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= ccf74f2390d60a2f9a75ef496d2564abb478f46a, < c57ea90f203c8b8b41a474f19a09000d0f841436; >= ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 119fb6f80c44dc1c65d604cf28e64c56bd9b6568; >= ccf74f2390d60a2f9a75ef496d2564abb478f46a, < b04ec131325baf4ea4577d6c6e6b86cf092e3731; >= ccf74f2390d60a2f9a75ef496d2564abb478f46a, < c318aa51830a3d2cc1229968fe521441c97356cd; >= ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9; >= ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 47f23a259517abbdb8032c057a1e8a6bf3734878 |
| Linux | Linux | 6.0 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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