Google 為 Android 系統推出了十二月份安全更新，今次修正了不少安全問題，當中包括數個屬 Critical Level，可以讓駭客透過特製檔案執行程式碼。
另外 Google 亦為 Pixel 3a 至 Pixel 6 系列裝置修正了近 100個問題。Pixel 3a-5a 系列裝置的 Factory Image 和 OTA Image 已經推出了，最新的 Firmware 編號為 SQ1A.211205.008，而 Pixel 6/Pro 就要在下星期更新才會推送。
Google 亦一併修正和改進了 Pixel 裝置中接近一百項問題，當中涉及 Apps, Audio, Camera, Display, Sensors 等不同方面。
Apps
Fix for issue causing Assistant to unintentionally start a phone call in certain conditions *[1].
Fix for stuck or frozen app UI in certain conditions *[7].Audio
General fixes & improvements for audio playback issues in certain apps *[1].
Fix for issue causing audio noise in videos captured while using certain phone cases *[1].
Fix for issue causing microphone to cut out during calls in certain conditions *[1].
Fix for issue causing occasional audio glitch when adjusting volume levels *[1].
Fix for issue occasionally preventing audio playback from speaker in certain conditions *[1].
Fix for issue preventing Now Playing to search for unrecognized music *[1].Battery & Power
Additional improvements for battery charging information shown in notification shade *[4].
General improvements for battery & thermal performance in certain conditions *[7].
General improvements for wireless charging in certain conditions *[5].
Improvements for alignment detection on Pixel Stand in certain conditions *[5].
Fix for issues occasionally causing incorrect Battery usage accounting to display in Settings *[7].Biometrics
General improvements for fingerprint sensor stability & performance *[1].
Additional fixes for issues preventing enrollment of new fingerprints in certain conditions *[1].
General improvements for face unlock stability & performance *[6].Bluetooth
General Bluetooth stability improvements for certain conditions *[3].
Fix for distorted audio over Bluetooth in certain scenarios *[1].
Fix for issue causing Bluetooth to turn on after disabling in certain conditions *[7].
Fix for volume adjustment issues with certain Bluetooth audio devices *[7].Camera
General image quality improvements in camera preview/capture *[1].
General improvements for camera stability & performance *[1].
General improvements for auto-focus response in certain capture modes *[1].
General improvements for color consistency in viewfinder preview *[1].
Fix for issue causing blank viewfinder preview in certain conditions *[1].Display & Graphics
Enable ANGLE graphics support library for certain apps and games *[1].
Add additional example images for display color options in Settings *[7].
General improvements to keep the screen on after multiple manual wakes *[7].
General improvements for Adaptive brightness response in certain conditions *[7].
Fix for occasional screen flicker during brightness adjustment *[1].
Fix for issue preventing Smooth Display to switch display refresh rate in certain conditions *[1].
Fix for issue causing screen flicker after locking or unlocking device in certain conditions *[1].
Fix for occasional white screen flash after display goes to sleep *[7].Framework
Fix for issue causing app icons to display as pending downloads after installation completes *[7].
Fix for issue causing Play store app installation to pause indefinitely in certain conditions *[7].
Fix for issue occasionally preventing Work Profile setup to complete in certain conditions *[7].
Fix for issue preventing all settings or apps to be restored from backup during setup in certain conditions *[7].Media
Fix for issue causing system crash during media playback in certain conditions *[7].Network & Telephony
General improvements for network connection stability & performance *[7].
Fix for crash in Settings when toggling Airplane mode on certain network configurations *[7].
Fix for issue that disabled call features on certain devices or networks in certain conditions *[1].Sensors
General improvements for sensor stability & response in certain conditions *[2].
General improvements for Quick Tap response & performance *[2].
General improvements for Auto-rotate response in certain device orientations *[4].
General improvements for Adaptive brightness response in certain conditions *[7].
Fix for issue preventing lift to wake and double tap to wake in certain conditions *[1].
Fix for issue preventing Always-on-display from turning on in certain conditions *[1].
Fix for issue causing unexpected haptics or vibration in certain conditions *[1].System
Kernel update to 4.9.279 for Pixel 3a & Pixel 3a XL.
Kernel update to 4.14.243 for Pixel 4, Pixel 4 XL & Pixel 4a.
Kernel update to 4.19.202 for Pixel 4a (5G), Pixel 5 & Pixel 5a (5G).
General improvements for system stability & performance *[7] Fix for issue causing device to freeze after sleeping while charging in certain conditions *[1].
Fix for issue occasionally preventing OTA updates to install *[7].User Interface
Add Material You dynamic theming support for the device boot animation *[7].
Improvements for Internet tile in Quick Settings *[7].
Improvements for Quick Settings layout in certain device orientations *[7].
Fix for issue causing display to stay on during wireless charging *[5].
Fix for issue causing Game Dashboard icon to display over lock screen *[7].
Fix for issue causing incorrect colors or theme to display in Quick Settings in certain conditions *[7].
Fix for issue causing lock screen icons to display in notification shade in certain conditions *[7].
Fix for issue causing notification History & Clear all buttons to occasionally display incorrectly *[7].
Fix for issue causing persistent app media controls in notification shade in certain conditions *[7].
Fix for issue causing persistent call notification in certain conditions *[7].
Fix for issue causing persistent Turn off work apps button in app drawer *[7].
Fix for issue causing screen flicker after locking or unlocking device in certain conditions *[7].
Fix for issue causing Settings to crash in Conversations menu in certain conditions *[7].
Fix for issue causing undismissable Game Dashboard button during gameplay in certain conditions *[7].
Fix for issue causing app drawer to scroll to the top after clearing search query *[7].
Fix for issue causing certain home screen icons to appear misaligned in certain conditions *[7].
Fix for issue enabling Quick Settings toggles to be tapped from home screen in certain conditions *[7].
Fix for issue hiding date or time in Quick Settings in certain conditions *[7].
Fix for issue occasionally causing blank background on home screen after setting wallpaper *[7].
Fix for issue occasionally causing Quick Settings to pull down after unlocking device *[7].
Fix for issue occasionally causing UI elements to display with transparent backgrounds *[7].
Fix for issue occasionally displaying Work Profile badge icon on personal apps or contacts *[7].
Fix for issue preventing conversation bubble to be dismissed in certain conditions *[7].
Fix for issue preventing search results to display in Settings in certain conditions *[7].
Fix for occasional screen flicker in notification shade when dragging from top of screen *[7].
Fix for occasional flickering when quickly switching between apps in certain conditions *[7].Wi-Fi
General improvements for Wi-Fi stability & performance *[7].
Fix for issue that would occasionally disconnect device from Wi-Fi in certain conditions *[1].—————————————————————-
Device Applicability
*[1] Included on Pixel 6 & Pixel 6 Pro
*[2] Included on Pixel 4a (5G), Pixel 5, Pixel 5a (5G), Pixel 6 & Pixel 6 Pro
*[3] Included on Pixel 4a (5G), Pixel 5, Pixel 5a (5G)
*[4] Included on Pixel 4, Pixel 4 XL, Pixel 4a, Pixel 4a (5G), Pixel 5, Pixel 5a (5G), Pixel 6 & Pixel 6 Pro
*[5] Included on Pixel 4 / XL, Pixel 5, Pixel 6 & Pixel 6 Pro
*[6] Included on Pixel 4 & Pixel 4 XL
*[7] Included on Pixel 3a, Pixel 3a XL, Pixel 4, Pixel 4 XL, Pixel 4a, Pixel 4a (5G), Pixel 5, Pixel 5a (5G), Pixel 6 & Pixel 6 Pro
Source: Google