Bug 2467121 (CVE-2026-43228) - CVE-2026-43228 kernel: hfs: Replace BUG_ON with error handling for CNID count checks
Summary: CVE-2026-43228 kernel: hfs: Replace BUG_ON with error handling for CNID count...
Keywords:
Status: NEW
Alias: CVE-2026-43228
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-06 13:05 UTC by OSIDB Bzimport
Modified: 2026-05-06 22:23 UTC (History)
2 users (show)

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Description OSIDB Bzimport 2026-05-06 13:05:24 UTC 
In the Linux kernel, the following vulnerability has been resolved:

hfs: Replace BUG_ON with error handling for CNID count checks

In a06ec283e125 next_id, folder_count, and file_count in the super block
info were expanded to 64 bits, and BUG_ONs were added to detect
overflow. This triggered an error reported by syzbot: if the MDB is
corrupted, the BUG_ON is triggered. This patch replaces this mechanism
with proper error handling and resolves the syzbot reported bug.

Singed-off-by: Jori Koolstra <jkoolstra>
Comment 1 Keith Grant 2026-05-06 22:21:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050655-CVE-2026-43228-4b65@gregkh/T
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