CVE-2026-90283 hugetlbfs: release subpool on fill_super failure
A local attacker can cause a memory leak and potential denial of service by triggering a failure during hugetlbfs mount with specific options.
- 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-2026-90283?
CVE-2026-90283 is a memory corruption vulnerability in Linux, published on 17 Sep 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:
hugetlbfs: release subpool on fill_super failure
hugetlbfs_fill_super() allocates a hugepage subpool when size or min_size mount options are specified. hugepage_new_subpool() may also reserve huge pages for min_size.
If root dentry creation fails after the subpool is created, the failure path frees the subpool with kfree(). This bypasses hugepage_put_subpool() and can leave min_size reservations charged.
Use hugepage_put_subpool() on the failure path, matching the normal put_super path.
Which versions are affected by CVE-2026-90283?
How do I fix CVE-2026-90283?
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-2026-90283 being exploited?
There is no known exploitation of CVE-2026-90283 in the wild and no public exploit code.
Sources
Also known as AZL-102600, BELL-CVE-2026-90283, DEBIAN-CVE-2026-90283, GHSA-j4hm-6c8x-4hfr, UBUNTU-CVE-2026-90283.