CVE-2026-72015 fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list
A double-free vulnerability in the Linux kernel resctrl subsystem allows local attackers to cause denial of service or potentially escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72015?
CVE-2026-72015 is an use after free vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list
A pseudo-locked group's RMID is freed when it is created. On unmount rmdir_all_sub() unconditionally frees all RMID of all groups, resulting in a double-free of the pseudo-locked group's RMID. The consequence of this is that the original free results in the pseudo-locked group's RMID being added to the rmid_free_lru linked list and the second free then attempts to add the same RMID entry to the rmid_free_lru again.
Do not double-free a pseudo-locked group's RMID.
Which versions are affected by CVE-2026-72015?
How do I fix CVE-2026-72015?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-72015 being exploited?
There is no known exploitation of CVE-2026-72015 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72015, DEBIAN-CVE-2026-72015, GHSA-wxqw-c972-64f8, UBUNTU-CVE-2026-72015.