Check my issue. I wrote "SELinux allow" policies for Qt socketcan apps on Enforcing mode. If you have android source code of your device, you can add the policy in the source code.
My issue: https://bugreports.qt.io/browse/QTBUG-118600

Can you click on the link below and do what is said in the last 1-2 messages so that the Selinux problem can at least be investigated by Qt, or can you at least share a log( with device specs, at least Android version etc.) indicating that you have the same problem in the link?

https://bugreports.qt.io/browse/QTBUG-118600

Thanks!

android:arm64-v8a:LIBS += -L/$$PWD/android_libs/libsocketcan/lib -lsocketcan
android:arm64-v8a:INCLUDEPATH += /$$PWD/android_libs/libsocketcan/include
android:arm64-v8a:DEPENDPATH += /$$PWD/android_libs/libsocketcan/include

It worked. Thank you again. you've saved me :D

Check the two functions at the bottom of the page : https://doc.qt.io/qt-6/qtserialbus-socketcan-overview.html
Libsocketcan sources: https://github.com/lalten/libsocketcan/tree/master
My github for precompiled libsocketcan : https://github.com/osos11-Git/libsocketcan_android
You should add the following to your .pro project file:
$$PWD -> your project directory

android:arm64-v8a:LIBS += -L/$$PWD/android_libs/libsocketcan/lib -lsocketcan
android:arm64-v8a:INCLUDEPATH += /$$PWD/android_libs/libsocketcan/include
android:arm64-v8a:DEPENDPATH += /$$PWD/android_libs/libsocketcan/include
 
contains(ANDROID_TARGET_ARCH,arm64-v8a) {

    ANDROID_EXTRA_LIBS = \
        $$PWD/android_libs/libsocketcan/lib/libsocketcan.so
}

Check my issue. I wrote "SELinux allow" policies for Qt socketcan apps on Enforcing mode. If you have android source code of your device, you can add the policy in the source code.
My issue: https://bugreports.qt.io/browse/QTBUG-118600

Additionally i set this parameters on the board.

setenforce 0
ip link set can0 up type can bitrate 250000     

Log when the application was deployed

D CompatibilityChangeReporter: Compat change id reported: 171979766; UID 1010109; state: ENABLED
W ziparchive: Unable to open '/data/app/~~Z9lSHxcSdAN667SHOjZS4g==/teste.qmake-YkNiMRALxdP-xXK51Dmo4A==/base.dm': No such file or directory
W ziparchive: Unable to open '/data/app/~~Z9lSHxcSdAN667SHOjZS4g==/teste.qmake-YkNiMRALxdP-xXK51Dmo4A==/base.dm': No such file or directory
V GraphicsEnvironment: ANGLE Developer option for 'teste.qmake' set to: 'default'
V GraphicsEnvironment: ANGLE GameManagerService for teste.qmake: false
V GraphicsEnvironment: Neither updatable production driver nor prerelease driver is supported.
D NetworkSecurityConfig: No Network Security Config specified, using platform default
D NetworkSecurityConfig: No Network Security Config specified, using platform default
I RenderThread: type=1400 audit(0.0:100): avc: denied { open } for path="/dev/__properties__/u:object_r:vendor_default_prop:s0" dev="tmpfs" ino=319 scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:object_r:vendor_default_prop:s0 tclass=file permissive=1
I RenderThread: type=1400 audit(0.0:101): avc: denied { getattr } for path="/dev/__properties__/u:object_r:vendor_default_prop:s0" dev="tmpfs" ino=319 scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:object_r:vendor_default_prop:s0 tclass=file permissive=1
W System  : ClassLoader referenced unknown path:
I RenderThread: type=1400 audit(0.0:102): avc: denied { map } for path="/dev/__properties__/u:object_r:vendor_default_prop:s0" dev="tmpfs" ino=319 scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:object_r:vendor_default_prop:s0 tclass=file permissive=1
I QtCore  : Start
I Qt      : qt started
D CompatibilityChangeReporter: Compat change id reported: 210923482; UID 1010109; state: DISABLED
D CompatibilityChangeReporter: Compat change id reported: 37756858; UID 1010109; state: ENABLED
E OpenGLRenderer: Device claims wide gamut support, cannot find matching config, error = EGL_SUCCESS
W OpenGLRenderer: Failed to initialize 101010-2 format, error = EGL_SUCCESS
I display : open gpu gralloc module!
E OpenGLRenderer: Unable to match the desired swap behavior.
W Parcel  : Expecting binder but got null!
W Qt A11Y : Could not (yet) activate platform accessibility.
W qt.canbus.plugins.socketcan: : Cannot load library socketcan: (dlopen failed: library "socketcan" not found)
I qt.canbus.plugins.socketcan: : Cannot load library libsocketcan, some functionality will not be available.
I qt.canbus.plugins.socketcan: Cannot load library socketcan: (dlopen failed: library "socketcan" not found)
W qt.canbus.plugins.socketcan: : Function can_set_bitrate() is not available.
W qt.canbus.plugins.socketcan: : Cannot apply parameter: 4 with value: 500000.
D libteste_Android_Qmake_arm64-v8a.so: QList("passthrucan", "peakcan", "socketcan", "tinycan", "virtualcan")
I qtMainLoopThrea: type=1400 audit(0.0:103): avc: denied { create } for scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1
I qtMainLoopThrea: type=1400 audit(0.0:104): avc: denied { ioctl } for path="socket:[234517]" dev="sockfs" ino=234517 ioctlcmd=0x8933 scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1
I qtMainLoopThrea: type=1400 audit(0.0:105): avc: denied { bind } for scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1
I qtMainLoopThrea: type=1400 audit(0.0:106): avc: denied { setopt } for scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1
D libteste_Android_Qmake_arm64-v8a.so: 0
D libteste_Android_Qmake_arm64-v8a.so: 0
D libteste_Android_Qmake_arm64-v8a.so: 0
I qtMainLoopThrea: type=1400 audit(0.0:107): avc: denied { read } for scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1
D libteste_Android_Qmake_arm64-v8a.so: true
D libteste_Android_Qmake_arm64-v8a.so: false
I qtMainLoopThrea: type=1400 audit(0.0:108): avc: denied { read } for scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1
I qtMainLoopThrea: type=1400 audit(0.0:109): avc: denied { ioctl } for path="socket:[234517]" dev="sockfs" ino=234517 ioctlcmd=0x8906 scontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tcontext=u:r:untrusted_app_30:s0:c109,c256,c522,c768 tclass=can_socket permissive=1

Now i'm trying to cross compile libsocketcan.so to aarch64.

which plugins?

qt.canbus.plugins.socketcan

Did you deploy the dependencies of this plug-in?

Comment out the "if not Android" and "only Linux" conditions within the cmake files. Compile and install. So you get all plugins for Android including "socketcan".

Check this 3 files:
https://github.com/qt/qtserialbus/blob/6.6/tests/auto/CMakeLists.txt -> comment out line 25 and 27

https://github.com/qt/qtserialbus/blob/6.6/src/serialbus/configure.cmake -> comment out line 32 and 36

https://github.com/qt/qtserialbus/blob/6.6/src/tools/CMakeLists.txt -> comment out line 6

Make sure you are using the correct version of the "qtserialbus" repo .
Make sure you are using android cmake of Qt. (in your 6.6 sources. Like this /home/ubuntu/Qt/6.6/android_arm64_v8a/bin/qt-cmake)

And check it out: https://blog.csdn.net/qq_19649851/article/details/126227486
https://bugreports.qt.io/browse/QTBUG-118600

Did you also deploy the plugin's dependencies ?