The CyanogenMod team has released CyanogenMod 12.1, which allows users to run Android 5.1.1, Lollipop SDK v1 and IMAP idle support.

The build also brings with it a fix to Stagefright, although earlier fixes have been released for CyanogenMod 11 and CyanogenMod 12 as well. This means that users who are still using slightly older versions of the software can still receive the bug fixes if they are not able to or don't want to upgrade to the latest version just yet.

While it is true that a number of devices are ready for the rollout of the update, it will not be immediately available for all of them.

As stated on CyanogenMod's blog, "We're queuing up releases across three branches this evening. As always, these releases are being marked as 'known good' by their maintainer, and signed-off individually. This means that not every CM device will receive a release - only those marked as 'Good to go' by the maintainer."

Users whose devices are not yet included in the "Good to go" list should be able to wait patiently until their devices become ready. Otherwise, they can opt to install one of those builds that have been prereleased.

Security researchers say all Android devices running on Android 2.2 or higher are vulnerable to the Stagefright attack. Since it is estimated that there are over 1 billion Android devices currently being used, it means that there are over 950 million phones susceptible to the attack.

"The 11.0 and 12.0 builds are security releases built on top of the last CM11/12.0 releases, modified to include the recent security disclosures, including the vulnerabilities in Stagefright," said CyanogenMod.

Stagefright works by remotely attacking a user with an executed code through the use of multimedia text messages, where users fail to even see the message at all. It is considered the biggest security problem of Android to date, and has left almost 95 percent of users susceptible to the vulnerability.

Once affected, the device can be easily manipulated by the attacker to gain access to all data and even copy or delete it in the process. Other vulnerable areas include the microphone, camera, stored images and Bluetooth.

The CyanogenMod team said they want to make the software as fresh as possible. Having said that, users can expect to see a number of software upgrades every year. At this point, CyanogenMod is still considered as the world's most popular third-party Android ROM.

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