Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.16, < 6.1.151 |
| Debian | Debian Linux | 11.0 |
References
- https://git.kernel.org/stable/c/42c415c53ad2065088cc411d08925effa5b3d255Patch
- https://git.kernel.org/stable/c/85e66331b60601d903cceaf8c10a234db863cd78Patch
- https://git.kernel.org/stable/c/e9188f66e94955431ddbe2cd1cdf8ff2bb486abfPatch
- https://git.kernel.org/stable/c/f46e8ef8bb7b452584f2e75337b619ac51a7cadfPatch
- https://git.kernel.org/stable/c/f4a917e6cd6c798f7adf39907f117fc754db1283Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing ListThird Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
FAQ
What is CVE-2025-39842?
CVE-2025-39842 is a vulnerability with a CVSS score of 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 alread...
How severe is CVE-2025-39842?
CVE-2025-39842 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-39842?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.