CVE-2021-47209 sched/fair: Prevent dead task groups from regaining cfs_rq's

In the Linux kernel, the following vulnerability has been resolved: sched/fair: Prevent dead task groups from regaining cfsrq's Kevin is reporting crashes which point to a use-after-free of a cfsrq in updateblockedaverages. Initial debugging revealed that we've live cfsrq's onlist=1 in an about t...

UVI-2021-1002329 sched/fair: Prevent dead task groups from regaining cfs_rq's

sched/fair: Prevent dead task groups from regaining cfsrq's This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.5 by commit...