1

which scale is used in Nirvana's "Love Buzz"? is this an eastern scale? how is it possible to mix an eastern scale and a western rhythm? which scale should be used in its baseline?

3

It's the phrygian dominant scale, whose composition is (starting from E for example's sake):

Notes: E F G# A B C D
Intervals: 1 b2 3 4 5 b6 b7

Addressing your other questions:

is this an eastern scale?

Wikipedia article says:

This scale occurs in Indian, Middle Eastern, Eastern European, Central Asian, and Flamenco music. It is common in Arabic and Egyptian music [...]

So yes it is.

how is it possible to mix an eastern scale and a western rhythm?

Like in the very track you mentioned for instance ;)) Or in Dick Dale music as a more famous example.

which scale should be used in its baseline?

I assume you ask about on top of which chords can you play this scale. You can work it out yourself by observing its third stacks, here you have an E-based reference:

E7  FMaj7   G#dim   Ammaj7  Bm7b5   CMaj7#5 Dm7

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