{"id":"CVE-2026-43228","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Replace BUG_ON with error handling for CNID count checks\n\nIn a06ec283e125 next_id, folder_count, and file_count in the super block\ninfo were expanded to 64 bits, a…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Replace BUG_ON with error handling for CNID count checks\n\nIn a06ec283e125 next_id, folder_count, and file_count in the super block\ninfo were expanded to 64 bits, a…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-617"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.18, < 6.19.6"],"patched":["linux_kernel 6.19.6"],"published":"2026-05-06","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:30.447","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-43228","references":[{"url":"https://git.kernel.org/stable/c/559f856b109c45844816a1693e259f93d3556c61","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b226804532a875c10276168dc55ce752944096bd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b6536c1ced315fa645576d3a39c6e07f2a472962","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00143,"epssPercentile":0.03218,"ingestedAt":"2026-10-15T11:00:41.712Z","slug":"CVE-2026-43228","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nhfs: Replace BUG_ON with error handling for CNID count checks\n\nIn a06ec283e125 next_id, folder_count, and file_count in the super block\ninfo were expanded to 64 bits, and BUG_ONs were added to detect\noverflow. This triggered an error reported by syzbot: if the MDB is\ncorrupted, the BUG_ON is triggered. This patch replaces this mechanism\nwith proper error handling and resolves the syzbot reported bug.\n\nSinged-off-by: Jori Koolstra <jkoolstra@xs4all.nl>\n\n## Affected\n\n- `linux_kernel >= 6.18, < 6.19.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.6`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":222274,"id":"CVE-2026-43228","ts":1792065864399,"field":"cvss","old":null,"new":"5.5"},{"seq":222273,"id":"CVE-2026-43228","ts":1792065864399,"field":"severity","old":"none","new":"medium"}]}