Google has released one of the largest Android monthly security updates, fixing a total of 39 vulnerabilities — 15 rated critical, including four that can lead to a complete device compromise.

The patches, which are included in new firmware images that were released Monday for the company’s Nexus devices, will also be published to the Android Open Source Project over the next 24 hours.

They include a fix for a vulnerability that Google warned about two weeks ago and which is already being exploited by a publicly available rooting application. Tracked as CVE-2015-1805, the privilege escalation flaw was originally fixed in the Linux kernel in April 2014, but it didn’t become clear until February this year that it also affects Android.

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