An use-after-free (UAF) flaw was found when wakeup a waiter was in race in locks_delete_block in fs/locks.c in the Linux kernel's filesystem. A local attacker with a special user account (or root) may cause a denial of access (DoS), a system crash or leak internal kernel information.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1786175]
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
This exploit is only possible with a special privileged user account locally (AV:L, PR:H) so in the initial i set it to Priority:Low
Since this is a UAF problem which will expose kernel address which is readable (C:H) and modifiable (I:H) (by a special user along with root) set Priority: Medium.
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):