{"id":"CVE-2026-90420","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix infinite loop in nilfs_clean_segments()\n\nsyzbot reported a hung task in nilfs_transaction_begin()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix infinite loop in nilfs_clean_segments()\n\nsyzbot reported a hung task in nilfs_transaction_begin(). This occurs\nbecause the cleaner ioctl falls into an infin…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < e3e9367dae1a6392cbb14ab0b2ab5edbf39735c3","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < 217b967ad7887a3e1ebc08f46f6484e081acd4b4","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < 3bcdbdaac884a4baa59716cf9bd9470c75276e2d","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < d7afca8e4efbf4c455b4663c29ae59fde2f1b671","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < c07e5ad6539e7e9350d5c65cbf8adb69d1711b15","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < 1fc6df85b4954b6fda9c351843aaca3c06f66d8d","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < 8cea0bc78ac64cb88da49c07f80bf2cf9fb7aff8","Linux >= 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 < ce5a5ad1a8330a2fcfdd9ec2ab341be739e89a18","Linux 2.6.30"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:46.440","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90420","references":[{"url":"https://git.kernel.org/stable/c/1fc6df85b4954b6fda9c351843aaca3c06f66d8d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/217b967ad7887a3e1ebc08f46f6484e081acd4b4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3bcdbdaac884a4baa59716cf9bd9470c75276e2d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8cea0bc78ac64cb88da49c07f80bf2cf9fb7aff8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c07e5ad6539e7e9350d5c65cbf8adb69d1711b15","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce5a5ad1a8330a2fcfdd9ec2ab341be739e89a18","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d7afca8e4efbf4c455b4663c29ae59fde2f1b671","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e3e9367dae1a6392cbb14ab0b2ab5edbf39735c3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90420.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90420"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536781"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90420"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90420"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90420.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.794Z","epss":0.0022,"epssPercentile":0.12394,"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-835"],"slug":"CVE-2026-90420","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix infinite loop in nilfs_clean_segments()\n\nsyzbot reported a hung task in nilfs_transaction_begin(). This occurs\nbecause the cleaner ioctl falls into an infinite loop if\nnilfs_segctor_construct() repeatedly returns -EROFS (e.g. the device\nis remounted as read-only after an I/O error).\n\nCurrently in nilfs_clean_segments(), if err is non-zero, it logs the\nerror and sleeps but doesn't abort when it encounters a terminal error\nlike -EROFS. This causes the thread to loop forever.\n\nFix this by breaking out of the loop if nilfs_segctor_construct()\nreturns -EROFS. This matches the behaviour in\nnilfs_segctor_write_out(), which also handles -EROFS.\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-2026-90420.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225589,"id":"CVE-2026-90420","ts":1792498306894,"field":"cvss","old":null,"new":"5.5"},{"seq":225588,"id":"CVE-2026-90420","ts":1792498306894,"field":"severity","old":"none","new":"medium"}]}