Answer in brief
CVE-2026-63946 records a Unknown severity vulnerability in Bluetooth: ISO: fix UAF in iso_recv_frame. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c57ea90f203c8b8b41a474f19a09000d0f841436 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <119fb6f80c44dc1c65d604cf28e64c56bd9b6568 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <b04ec131325baf4ea4577d6c6e6b86cf092e3731 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c318aa51830a3d2cc1229968fe521441c97356cd || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <1a6b803b00ccdd7666506adbe01ddae1c72d1ca9 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <47f23a259517abbdb8032c057a1e8a6bf3734878 | c57ea90f203c8b8b41a474f19a09000d0f841436, 119fb6f80c44dc1c65d604cf28e64c56bd9b6568, b04ec131325baf4ea4577d6c6e6b86cf092e3731, c318aa51830a3d2cc1229968fe521441c97356cd, 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9, 47f23a259517abbdb8032c057a1e8a6bf3734878 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-63946 records a Unknown severity vulnerability in Bluetooth: ISO: fix UAF in iso_recv_frame. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c57ea90f203c8b8b41a474f19a09000d0f841436 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <119fb6f80c44dc1c65d604cf28e64c56bd9b6568 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <b04ec131325baf4ea4577d6c6e6b86cf092e3731 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c318aa51830a3d2cc1229968fe521441c97356cd || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <1a6b803b00ccdd7666506adbe01ddae1c72d1ca9 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <47f23a259517abbdb8032c057a1e8a6bf3734878 | c57ea90f203c8b8b41a474f19a09000d0f841436, 119fb6f80c44dc1c65d604cf28e64c56bd9b6568, b04ec131325baf4ea4577d6c6e6b86cf092e3731, c318aa51830a3d2cc1229968fe521441c97356cd, 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9, 47f23a259517abbdb8032c057a1e8a6bf3734878 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.