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CVE-2025-39842

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ocfs2: prevent release journal inode after journal shutdown Before calling ocfs2_delete_osb(), ocfs2_journal_shutdown() has alr…

Published Sep 19, 2025EPSS 0.17%

Overview

CVE-2025-39842 is a medium-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

ocfs2: prevent release journal inode after journal shutdown

Before calling ocfs2_delete_osb(), ocfs2_journal_shutdown() has already

been executed in ocfs2_dismount_volume(), so osb->journal must be NULL.

Therefore, the following calltrace will inevitably fail when it reaches

jbd2_journal_release_jbd_inode().

ocfs2_dismount_volume()->

ocfs2_delete_osb()->

ocfs2_free_slot_info()->

__ocfs2_free_slot_info()->

evict()->

ocfs2_evict_inode()->

ocfs2_clear_inode()->

jbd2_journal_release_jbd_inode(osb->journal->j_journal,

Adding osb->journal checks will prevent null-ptr-deref during the above

execution path.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/42c415c53ad2065088cc411d08925effa5b3d255Refgit.kernel.org/stable/c/85e66331b60601d903cceaf8c10a234db863cd78Refgit.kernel.org/stable/c/e9188f66e94955431ddbe2cd1cdf8ff2bb486abfRefgit.kernel.org/stable/c/f46e8ef8bb7b452584f2e75337b619ac51a7cadfRefgit.kernel.org/stable/c/f4a917e6cd6c798f7adf39907f117fc754db1283Reflists.debian.org/debian-lts-announce/2025/10/msg00008.htmlRefcert-portal.siemens.com/productcert/html/ssa-032379.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39842?

CVE-2025-39842 is a medium-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39842?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39842?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39842?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39842 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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