CVE-2026-68153 libceph: remove debugfs files before client teardown
A use-after-free in the Linux kernel's Ceph client allows attackers to cause denial of service or execute code via concurrent debugfs access.
- 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-2026-68153?
CVE-2026-68153 is a high-severity use after free 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:
libceph: remove debugfs files before client teardown
ceph_destroy_client() tears down the monitor client before removing the per-client debugfs files. A concurrent read of the monmap debugfs file can enter monmap_show() after ceph_monc_stop() has freed monc->monmap, triggering a use-after-free.
Remove the debugfs files before stopping the OSD and monitor clients. debugfs_remove() drains active handlers and prevents new accesses, so the debugfs callbacks can no longer race the rest of client teardown.
Weakness: CWE-416
Which versions are affected by CVE-2026-68153?
How do I fix CVE-2026-68153?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-68153 being exploited?
There is no known exploitation of CVE-2026-68153 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68153, DEBIAN-CVE-2026-68153, GHSA-3j44-h3h4-hxhf, UBUNTU-CVE-2026-68153.