Sony has started pushing out a new update to Xperia XZ, XZs and X Performance smartphones. It's basically a security update that moves the build number to 41.3.A.2.24, and includes Android security fixes for the month of January.

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The update bumps Android security to January 1 level. Now, why that's important is, Sony had said the update with fixes for "Spectre" and "Meltdown" vulnerabilities would bump the security level to "2018-01-05 or later." So it's safe to assume that these fixes aren't included in this update.