Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

• azl3 kernel 6.6.157.1-1 on Azure Linux 3.0

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

1. Nov 4, 2026 at 12:10 PM UTC
   • Added affected products: azl3 kernel 6.6.157.1-1 on Azure Linux 3.0.
   • Removed affected products: azl3 kernel 6.6.134.1-2 on Azure Linux 3.0, azl3 kernel 6.6.139.1-1 on Azure Linux 3.0, azl3 kernel 6.6.141.1-1 on Azure Linux 3.0, azl3 kernel 6.6.143.1-1 on Azure Linux 3.0, azl3 kernel 6.6.144.1-1 on Azure Linux 3.0.
   • Added fixed versions: 6.6.159.1-1.
   • The vendor changed its remediation guidance.

1. May 2, 2026 at 1:02 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

3. Oct 24, 2026 at 2:47 PM UTC
   Updated by Microsoft Security Response Center

   The vendor changed the advisory after it was first published.

4. Nov 7, 2026 at 7:05 AM UTC
   Confirmed at the source

   Our collector saw this advisory during a later source check.