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The Tibet AS$\gamma$ experiment has measured $\gamma$-ray flux of supernovaremnant G106.3+2.7 up to 100 TeV, suggesting it {being} potentially a"PeVatron". Challenge arises when the hadronic scenario requires a hard protonspectrum (with spectral index $\approx 1.8$), while {usual observations andnumerical simulations prefer} a soft proton spectrum {(with spectral index$\geq 2$)}. In this paper, we explore an alternative scenario to explain the$\gamma$-ray spectrum of G106.3+2.7 within the current understanding ofacceleration and escape processes. We consider that the cosmic ray {particles}are scattered by the turbulence driven via Bell instability. The resultinghadronic $\gamma$-ray spectrum is novel, dominating the contribution to theemission above 10\,TeV, and can explain the bizarre broadband spectrum ofG106.3+2.7 in combination with leptonic emission from the remnant.

On the hard $\gamma$-ray spectrum of the potential PeVatron supernova remnant G106.3+2.7