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CVE-2019-19318

Description

In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem_down_write_slowpath use-after-free because (in rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags returns an already freed pointer,

POC

Reference

- https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19318

- https://usn.ubuntu.com/4414-1/

Github

No PoCs found on GitHub currently.