In the Linux kernel, the following vulnerability has been resolved:
mm: list_lru: fix UAF for memory cgroup
The memcgroupfromslabobj() is supposed to be called under rcu lock or cgroup_mutex or others which could prevent returned memcg from being freed. Fix it by adding missing rcu read lock.
Found by code inspection.
[songmuchun@bytedance.com: only grab rcu lock when necessary, per Vlastimil]