Hi there, I'm affected by this bug as well. In my case I suddenly can't print on a printer connected via USB anymore, unless switching the AppArmor profile from enforce to complain. With the profile set to enforce, CUPS also isn't able to detect USB-connected printers anymore.
Here is what AppArmor logs, when I try to search for printers or try to print a test page: > kernel: audit: type=1400 audit(1773057657.554:21332): apparmor="DENIED" operation="capable" class="cap" profile="/usr/sbin/cupsd" pid=41719 comm="usb" capability=12 capname="net_admin" > kernel: audit: type=1400 audit(1773057657.554:21333): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21334): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21335): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21336): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21337): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21338): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21339): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21340): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 > kernel: audit: type=1400 audit(1773057657.554:21341): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cupsd" name="/" pid=41719 comm="usb" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
