Bug 2334426 (CVE-2024-56591)

Summary: CVE-2024-56591 kernel: Bluetooth: hci_conn: Use disable_delayed_work_sync
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Bluetooth subsystem of the Linux kernel, in the handling of delayed work within the hci_conn (Host Controller Interface connection) structure. The kernel used cancel_delayed_work_sync() when shutting down a connection, which cancels ongoing work but allows rescheduling. This could result in use-after-free conditions if the work is resubmitted after the associated object has been freed. Replacing it with disable_delayed_work_sync() prevents further scheduling, ensuring proper cleanup. A local attacker could potentially exploit this to trigger a use-after-free, leading to a denial of service or possible code execution.
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Description OSIDB Bzimport 2024-12-27 15:01:12 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: Use disable_delayed_work_sync

This makes use of disable_delayed_work_sync instead
cancel_delayed_work_sync as it not only cancel the ongoing work but also
disables new submit which is disarable since the object holding the work
is about to be freed.
Comment 1 Avinash Hanwate 2024-12-28 09:37:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122759-CVE-2024-56591-eaf9@gregkh/T
Comment 3 errata-xmlrpc 2025-05-13 08:37:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966