---
cve: "CVE-2026-63946"
severity: "HIGH"
cvss: 8.8
epss: "33%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-07-19 16:17:13"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T13:44:29+02:00"
---

# CVE-2026-63946

> 8.8 HIGH

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.176
- Kernel ≥ 6.6.143
- Kernel ≥ 6.12.93
- Kernel ≥ 6.18.35
- Kernel ≥ 7.0.12

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63946) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_