The September 2021 Security Update Bulletin is rolling out for the Pixel 3 series, Pixel 3a series, Pixel 4 series, Pixel 4a series, Pixel 5, and Pixel 5a. The Pixel-specific update addresses a few additional vulnerabilities in the kernel, Pixel software, and both open and closed-source Qualcomm components, Here are the build numbers for the latest Pixel security update:

  • Global:
    • Pixel 3 (XL): RQ3A.210905.001
    • Pixel 3a (XL): RQ3A.210905.001
    • Pixel 4 (XL): RQ3A.210905.001
    • Pixel 4a: RQ3A.210905.001
    • Pixel 4a (5G): RQ3A.210905.001
    • Pixel 5: RQ3A.210905.001
  • Japan
    • Pixel 5a: RD2A.210905.003
  • North America
    • Pixel 5a: RD2A.210905.002

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