  It has recently been pointed out that a component of the observed gamma ray
emission in the low-latitudes of Fermi Bubble has a spectral shape that can be
explained by a 10 GeV dark matter (DM) annihilating to tau leptons with a
cross-section of 2 x 10^{-27} cm^3/s. Motivated by this possibility, we revisit
the annihilation of a 10 GeV neutralino DM in the MSSM via stau exchange. The
required stau masses and mixing, consistent with LEP direct search and
electroweak precision constraints, are correlated with a possible enhancement
of the Higgs decay rate to two photons. We also explore the implications of
such a scenario for DM relic density and the muon anomalous magnetic moment,
taking into account the recent ATLAS bounds on the chargino and the first two
generation slepton masses, as well as the constraints on the Higgsino fraction
of a 10 GeV neutralino.
