Bug 2402231 (CVE-2023-53672)

Summary: CVE-2023-53672 kernel: btrfs: output extra debug info if we failed to find an inline backref
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A logic error was found in the Linux kernel's Btrfs filesystem in the inline extent backref lookup logic. A local user can trigger this issue by performing filesystem operations that attempt to insert an inline backref that should already exist but cannot be found, causing the driver to hit a WARN_ON assertion. This results in kernel warnings and potential system instability leading to denial of service.
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Description OSIDB Bzimport 2025-10-07 16:04:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: output extra debug info if we failed to find an inline backref

[BUG]
Syzbot reported several warning triggered inside
lookup_inline_extent_backref().

[CAUSE]
As usual, the reproducer doesn't reliably trigger locally here, but at
least we know the WARN_ON() is triggered when an inline backref can not
be found, and it can only be triggered when @insert is true. (I.e.
inserting a new inline backref, which means the backref should already
exist)

[ENHANCEMENT]
After the WARN_ON(), dump all the parameters and the extent tree
leaf to help debug.
Comment 1 Jon Moroney 2025-10-07 17:39:26 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100706-CVE-2023-53672-cfad@gregkh/T