CVE-2026-74533Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- 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)
- Not given
- 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
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from dc26097bdb864a0d5955b9a25e43376ffc1af99b before 876a3e94c70d0859d1dad1c986112d4f0d99eba8; from dc26097bdb864a0d5955b9a25e43376ffc1af99b before af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c; f53e7489273dc2bb307bf50f319b3762d45534f0; a58d0f5dac322e16cc75334d000666512341bde5; from 6.11.11 before 6.12; from 6.12.2 before 6.13 | CNA record |
References
- https://git.kernel.org/stable/c/876a3e94c70d0859d1dad1c986112d4f0d99eba8
- https://git.kernel.org/stable/c/af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c
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.