CVE-2026-98447 xfs: fix wild memcpy access when formatting ondisk rtrefcount btree roots
A memory corruption vulnerability in the Linux kernel XFS filesystem allows attackers to cause denial of service or execute arbitrary code via wild memcpy access.
- 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-2026-98447?
CVE-2026-98447 is a memory corruption vulnerability in Linux, published on 18 Oct 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:
xfs: fix wild memcpy access when formatting ondisk rtrefcount btree roots
LOLLM noticed that the inode btree root formatting methods copy too many bytes -- there's only one set of keys in node blocks, not two. This causes memory corruption of whatever's beyond the buffers.
Which versions are affected by CVE-2026-98447?
How do I fix CVE-2026-98447?
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-2026-98447 being exploited?
There is no known exploitation of CVE-2026-98447 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98447, DEBIAN-CVE-2026-98447, GHSA-wj43-8f87-c9v3, UBUNTU-CVE-2026-98447.