CVE-2026-64146 erofs: fix metabuf leak in inode xattr initialization
A memory leak in the Linux kernel's EROFS filesystem can lead to resource exhaustion and denial of service.
- 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-2026-64146?
CVE-2026-64146 is a medium-severity memory corruption vulnerability in Linux kernel, published on 19 Jul 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:
erofs: fix metabuf leak in inode xattr initialization
commit bb88e8da0025 ("erofs: use meta buffers for xattr operations") converted xattr operations to use on-stack erofs_buf instances. erofs_init_inode_xattrs() uses such a metabuf while reading the inline xattr header and shared xattr id array.
Some error paths after erofs_read_metabuf() leave through out_unlock without dropping the metabuf, so the folio reference can leak.
Consolidate the cleanup at out_unlock. erofs_put_metabuf() is a no-op if no folio has been acquired, and this keeps all paths after taking EROFS_I_BL_XATTR_BIT covered by a single cleanup site.
Weakness: CWE-401
Which versions are affected by CVE-2026-64146?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64146?
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-2026-64146 being exploited?
There is no known exploitation of CVE-2026-64146 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-92826, BELL-CVE-2026-64146, DEBIAN-CVE-2026-64146, GHSA-556c-3r39-wvfx, UBUNTU-CVE-2026-64146.