Bug 2389475 (CVE-2025-38615)

Summary: CVE-2025-38615 kernel: fs/ntfs3: cancle set bad inode after removing name fails
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 2025-08-19 18:02:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: cancle set bad inode after removing name fails

The reproducer uses a file0 on a ntfs3 file system with a corrupted i_link.
When renaming, the file0's inode is marked as a bad inode because the file
name cannot be deleted.

The underlying bug is that make_bad_inode() is called on a live inode.
In some cases it's "icache lookup finds a normal inode, d_splice_alias()
is called to attach it to dentry, while another thread decides to call
make_bad_inode() on it - that would evict it from icache, but we'd already
found it there earlier".
In some it's outright "we have an inode attached to dentry - that's how we
got it in the first place; let's call make_bad_inode() on it just for shits
and giggles".
Comment 1 Alexander B 2025-08-20 10:52:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081925-CVE-2025-38615-5f57@gregkh/T