CVE-2026-89652

Status: UPDATED  |  Advisory ID: CVE-2026-89652

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

ceph: bound copied dentry name length in NFS export get_name

ceph_get_name() copies the MDS-supplied name into the caller's

NAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)

and then writes name[rinfo->dname_len] = 0, without checking dname_len

against NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply

with dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies

rde->name / rde->name_len the same unchecked way.

Impact: a malicious or compromised Ceph MDS overflows the NAME_MAX name

buffer in a client's NFS-export get_name path, a slab out-of-bounds write

reported by KASAN. Reachable when a CephFS mount is re-exported over NFS.

Add ceph_export_copy_name(), which rejects lengths above NAME_MAX with

-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and

__get_snap_name(). (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References