CVE-2026-43228

MEDIUMNVD 5.55.5—

5.5

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

CVSS v3: 5.5
EG Score: 5.5(high)
EPSS: 3.1%
KEV: Not listed

Published

May 6, 2026

Last Modified

May 8, 2026

References (2)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b226804532a875c10276168dc55ce752944096bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6536c1ced315fa645576d3a39c6e07f2a472962

Vendor Advisories for CVE-2026-43228(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-43228
Microsoft Security Response Center (MSRC)
hfs: Replace BUG_ON with error handling for CNID count checks

Frequently asked(5)

What is CVE-2026-43228?

CVE-2026-43228 is a medium vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: hfs: Replace BUG_ON with error handling for CNID count checks In a06ec283e125 nextid, foldercount, 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…

When was CVE-2026-43228 disclosed?

CVE-2026-43228 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on May 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-43228 actively exploited?

CVE-2026-43228 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-43228?

CVE-2026-43228 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2026-43228?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43228, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-43228

📅 Published

🔄 Last Modified

🔗 References (2)

📣 Vendor Advisories for CVE-2026-43228(1)

❓ Frequently asked(5)