There is a major issue, not sure if in the rest of the world, but in Canada, the service provider has to request, and commonly pay for, the patch to which the manufacturer completes and then the service provider then pushes out to their devices. At least that is how it was when the E911 issue happened, it may be better now, but knowing Telecoms in Canada, I wouldn't be surprised if it wasn't.
It's not better. Look at the proposed target released dates for StageFright patches by Telus. And considering that it is not even fully patches, this only adds to the insanity of the situation with regards to Android fragmentation and carrier's controlling releases.
OEM Model Target Release
HTC One M7 August 14th
HTC One M8 August 14th
HTC One M9 August 14th
HTC Desire 320a August 28th
HTC Desire 601 August 14th
LG Nexus 4 Completed
LG Nexus 5 Completed
Motorola Nexus 6 Completed
Samsung Galaxy S5 August 11th
SamsungGalaxy S5 Active August 11th
Samsung Galaxy Alpha August 21st
Samsung Galaxy Grand Prime August 21st
Samsung Galaxy S6 Completed
Samsung Galaxy S6 Edge Completed
Samsung Galaxy S4 August 28th
Samsung Galaxy Note 3 August 30th
Samsung Galaxy Note 4 August 11th
Samsung Galaxy Core September 4th
Samsung Galaxy Tab S 8.4 September 4th
Samsung Galaxy Tab S 10.5 September 4th
Sony Xperia Z3 August 14th
There is a major issue, not sure if in the rest of the world, but in Canada, the service provider has to request, and commonly pay for, the patch to which the manufacturer completes and then the service provider then pushes out to their devices. At least that is how it was when the E911 issue happened, it may be better now, but knowing Telecoms in Canada, I wouldn't be surprised if it wasn't.