CVE-2026-72161 ocfs2: add journal NULL check in ocfs2_checkpoint_inode()
A NULL pointer dereference in the Linux kernel OCFS2 filesystem during unmount can cause a system crash, requiring a kernel patch.
- 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-2026-72161?
CVE-2026-72161 is a vulnerability in Linux, published on 15 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:
ocfs2: add journal NULL check in ocfs2_checkpoint_inode()
During unmount, ocfs2_journal_shutdown() frees the journal and sets osb->journal to NULL. Later, when VFS evicts remaining cached inodes, ocfs2_evict_inode() -> ocfs2_clear_inode() -> ocfs2_checkpoint_inode() -> ocfs2_ci_fully_checkpointed() dereferences osb->journal, causing a NULL pointer dereference.
Fix this by adding a NULL check for osb->journal in ocfs2_checkpoint_inode(). If the journal is NULL, it has already been fully flushed and destroyed during shutdown, so there is nothing to checkpoint.
Which versions are affected by CVE-2026-72161?
How do I fix CVE-2026-72161?
Apply the vendor's patch.
Is CVE-2026-72161 being exploited?
There is no known exploitation of CVE-2026-72161 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72161, DEBIAN-CVE-2026-72161, GHSA-xwjc-q49f-3x92, UBUNTU-CVE-2026-72161.