Bug 2400722 (CVE-2023-53450)

Summary: CVE-2023-53450 kernel: ext4: remove a BUG_ON in ext4_mb_release_group_pa()
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 2025-10-01 12:03:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ext4: remove a BUG_ON in ext4_mb_release_group_pa()

If a malicious fuzzer overwrites the ext4 superblock while it is
mounted such that the s_first_data_block is set to a very large
number, the calculation of the block group can underflow, and trigger
a BUG_ON check.  Change this to be an ext4_warning so that we don't
crash the kernel.
Comment 1 Jon Moroney 2025-10-01 22:33:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100103-CVE-2023-53450-35c4@gregkh/T