Bug 2400719 (CVE-2023-53473)

Summary: CVE-2023-53473 kernel: ext4: improve error handling from ext4_dirhash()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-01 12:03:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ext4: improve error handling from ext4_dirhash()

The ext4_dirhash() will *almost* never fail, especially when the hash
tree feature was first introduced.  However, with the addition of
support of encrypted, casefolded file names, that function can most
certainly fail today.

So make sure the callers of ext4_dirhash() properly check for
failures, and reflect the errors back up to their callers.
Comment 1 Jon Moroney 2025-10-01 22:42:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100110-CVE-2023-53473-bf5d@gregkh/T