Bug 2348005 (CVE-2022-49555)

Summary: CVE-2022-49555 kernel: Bluetooth: hci_qca: Use del_timer_sync() before freeing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:14:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_qca: Use del_timer_sync() before freeing

While looking at a crash report on a timer list being corrupted, which
usually happens when a timer is freed while still active. This is
commonly triggered by code calling del_timer() instead of
del_timer_sync() just before freeing.

One possible culprit is the hci_qca driver, which does exactly that.

Eric mentioned that wake_retrans_timer could be rearmed via the work
queue, so also move the destruction of the work queue before
del_timer_sync().
Comment 1 Avinash Hanwate 2025-02-26 13:49:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022616-CVE-2022-49555-64d2@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 18:02:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022616-CVE-2022-49555-64d2@gregkh/T