CVE-2026-43228
HFS Filesystem CNID Count Overflow Handling Vulnerability
Publication date: 2026-05-06
Last updated on: 2026-05-06
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is related to the Linux kernel's handling of the HFS filesystem. Specifically, certain counters in the filesystem's super block (next_id, folder_count, and file_count) were expanded to 64 bits, and BUG_ON checks were added to detect overflow conditions. However, if the metadata (MDB) became corrupted, these BUG_ON checks would trigger a kernel error. The vulnerability was that these BUG_ON checks caused the kernel to crash instead of handling the error gracefully. The fix replaced these BUG_ON checks with proper error handling to avoid crashes when the metadata is corrupted.
How can this vulnerability impact me? :
This vulnerability can cause the Linux kernel to crash if the HFS filesystem metadata is corrupted, due to the BUG_ON checks triggering a kernel panic. This can lead to system instability, unexpected reboots, or denial of service, impacting the availability of the system.