Answer in brief
CVE-2026-74533 records a Unknown severity vulnerability in Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero. 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 | >=dc26097bdb864a0d5955b9a25e43376ffc1af99b <876a3e94c70d0859d1dad1c986112d4f0d99eba8 || >=dc26097bdb864a0d5955b9a25e43376ffc1af99b <af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c || f53e7489273dc2bb307bf50f319b3762d45534f0 || a58d0f5dac322e16cc75334d000666512341bde5 || >=6.11.11 <6.12 || >=6.12.2 <6.13 | 876a3e94c70d0859d1dad1c986112d4f0d99eba8, af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c, 6.12, 6.13 |
| Linux/Linuxgeneric | 6.13 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race [Task hdev->workqueue] [Task 2] iso_recv iso_conn_put(conn) conn = LOAD hcon->iso_data iso_conn_free(conn) iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL kfree(conn) kref_get_unless_zero(&conn->ref) /* UAF */ and also to races in iso_conn_add() vs. iso_conn_free(). Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74533 records a Unknown severity vulnerability in Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero. 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 | >=dc26097bdb864a0d5955b9a25e43376ffc1af99b <876a3e94c70d0859d1dad1c986112d4f0d99eba8 || >=dc26097bdb864a0d5955b9a25e43376ffc1af99b <af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c || f53e7489273dc2bb307bf50f319b3762d45534f0 || a58d0f5dac322e16cc75334d000666512341bde5 || >=6.11.11 <6.12 || >=6.12.2 <6.13 | 876a3e94c70d0859d1dad1c986112d4f0d99eba8, af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c, 6.12, 6.13 |
| Linux/Linuxgeneric | 6.13 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero hci_conn::iso_data is accessed and modified without lock or RCU. This leads to a race [Task hdev->workqueue] [Task 2] iso_recv iso_conn_put(conn) conn = LOAD hcon->iso_data iso_conn_free(conn) iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL kfree(conn) kref_get_unless_zero(&conn->ref) /* UAF */ and also to races in iso_conn_add() vs. iso_conn_free(). Fix by adding spinlock hci_conn::proto_lock and using it to guard hci_conn::iso_data.
Quoted source text, attributed separately from HOL analysis.