Bug 2464408 (CVE-2026-43019) - CVE-2026-43019 kernel: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync
Summary: CVE-2026-43019 kernel: Bluetooth: hci_conn: fix potential UAF in set_cig_para...
Keywords:
Status: NEW
Alias: CVE-2026-43019
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-01 15:05 UTC by OSIDB Bzimport
Modified: 2026-05-01 16:48 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-01 15:05:09 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

hci_conn lookup and field access must be covered by hdev lock in
set_cig_params_sync, otherwise it's possible it is freed concurrently.

Take hdev lock to prevent hci_conn from being deleted or modified
concurrently.  Just RCU lock is not suitable here, as we also want to
avoid "tearing" in the configuration.
Comment 1 Keith Grant 2026-05-01 16:45:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050157-CVE-2026-43019-0c5c@gregkh/T
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