Bug 2460690 (CVE-2026-31451)

Summary: CVE-2026-31451 kernel: ext4: replace BUG_ON with proper error handling in ext4_read_inline_folio
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's ext4 filesystem. When processing inline data, if the data size exceeded the expected page size, it could lead to a kernel panic. This issue could be triggered by a local user with access to a specially crafted or corrupted ext4 filesystem, resulting in a system crash and a denial of service.
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Description OSIDB Bzimport 2026-04-22 15:05:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ext4: replace BUG_ON with proper error handling in ext4_read_inline_folio

Replace BUG_ON() with proper error handling when inline data size
exceeds PAGE_SIZE. This prevents kernel panic and allows the system to
continue running while properly reporting the filesystem corruption.

The error is logged via ext4_error_inode(), the buffer head is released
to prevent memory leak, and -EFSCORRUPTED is returned to indicate
filesystem corruption.
Comment 1 Keith Grant 2026-04-22 17:30:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042248-CVE-2026-31451-cec9@gregkh/T