Bug 2419920 (CVE-2025-40318)

Summary: CVE-2025-40318 kernel: Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A use-after-free flaw was found in hci_cmd_sync_dequeue_once in net/bluetooth/hci_sync.c in Bluetooth: hci_sync in Linux Kernel. This vulnerability could even lead to a kernel information leak problem.
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Description OSIDB Bzimport 2025-12-08 07:08:48 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

hci_cmd_sync_dequeue_once() does lookup and then cancel
the entry under two separate lock sections. Meanwhile,
hci_cmd_sync_work() can also delete the same entry,
leading to double list_del() and "UAF".

Fix this by holding cmd_sync_work_lock across both
lookup and cancel, so that the entry cannot be removed
concurrently.
Comment 1 Jon Moroney 2025-12-08 19:40:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120823-CVE-2025-40318-0f27@gregkh/T
Comment 4 errata-xmlrpc 2026-01-26 14:09:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:1194 https://access.redhat.com/errata/RHSA-2026:1194
Comment 5 errata-xmlrpc 2026-02-02 09:50:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1690 https://access.redhat.com/errata/RHSA-2026:1690
Comment 6 errata-xmlrpc 2026-02-02 15:25:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:1727 https://access.redhat.com/errata/RHSA-2026:1727