CVE-2026-68422 btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()
A memory leak in the Linux kernel's btrfs filesystem can lead to resource exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68422?
CVE-2026-68422 is a memory corruption vulnerability in Linux, published on 10 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:
btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()
If we have an unexpected reloc_root for our root, we jump to the out label but never drop the reference we obtained for root, resulting in a leak. Add a missing btrfs_put_root() call.
Which versions are affected by CVE-2026-68422?
How do I fix CVE-2026-68422?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68422 being exploited?
There is no known exploitation of CVE-2026-68422 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68422, DEBIAN-CVE-2026-68422, GHSA-v7mh-g6gq-fvrq, UBUNTU-CVE-2026-68422.