{"id":"CVE-2026-90418","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch\n\nSyzbot reported a kernel BUG triggered within nilfs_copy_dirty_pages(),\nwhich copies dirty DAT file…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch\n\nSyzbot reported a kernel BUG triggered within nilfs_copy_dirty_pages(),\nwhich copies dirty DAT file…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 8c26c4e2694a163d525976e804d81cd955bbb40c < 5166a21b12f549774f2983fa86d2526ea9e66ace","Linux >= 8c26c4e2694a163d525976e804d81cd955bbb40c < 4e1f21e7540b25d83f86b50780836ed7d2afcc93","Linux >= 8c26c4e2694a163d525976e804d81cd955bbb40c < 3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05","Linux >= 8c26c4e2694a163d525976e804d81cd955bbb40c < f181155baf0c93a74ebe804c6cecbe970e78ee9e","Linux >= 8c26c4e2694a163d525976e804d81cd955bbb40c < 66f4ad3ce158902e5f98afea93189972ed8750c2","Linux 3.10"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:46.167","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90418","references":[{"url":"https://git.kernel.org/stable/c/3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4e1f21e7540b25d83f86b50780836ed7d2afcc93","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5166a21b12f549774f2983fa86d2526ea9e66ace","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/66f4ad3ce158902e5f98afea93189972ed8750c2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f181155baf0c93a74ebe804c6cecbe970e78ee9e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90418.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90418"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536469"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90418"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90418"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90418.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.795Z","epss":0.00168,"epssPercentile":0.0603,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-367"],"slug":"CVE-2026-90418","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch\n\nSyzbot reported a kernel BUG triggered within nilfs_copy_dirty_pages(),\nwhich copies dirty DAT file folios/pages to its shadow page cache.  The\nBUG occurs when a retrieved dirty folio/page unexpectedly loses its\n'dirty' status.\n\nThis issue arises because, since the commit referenced below, the 'dirty'\nflag of a folio/page can be cleared asynchronously after the filesystem\ndetects metadata corruption and transitions to read-only mode.\n\nResolve the issue by returning an -EROFS error if the filesystem has\ntransitioned to read-only mode.  Also change the behavior to issue a\nkernel warning only once instead of triggering a kernel BUG when this\nunexpected 'dirty' state is detected while the filesystem is not in\nread-only mode.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90418.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225591,"id":"CVE-2026-90418","ts":1792498307971,"field":"cvss","old":null,"new":"5.5"},{"seq":225590,"id":"CVE-2026-90418","ts":1792498307971,"field":"severity","old":"none","new":"medium"}]}