Bug 2394611 (CVE-2025-39743)

Summary: CVE-2025-39743 kernel: jfs: truncate good inode pages when hard link is 0
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-11 17:02:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

jfs: truncate good inode pages when hard link is 0

The fileset value of the inode copy from the disk by the reproducer is
AGGR_RESERVED_I. When executing evict, its hard link number is 0, so its
inode pages are not truncated. This causes the bugon to be triggered when
executing clear_inode() because nrpages is greater than 0.
Comment 1 Jon Moroney 2025-09-11 20:04:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091139-CVE-2025-39743-75bd@gregkh/T