{"id":"CVE-2026-45915","title":"fat: avoid parent link count underflow in rmdir","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfat: avoid parent link count underflow in rmdir\n\nCorrupted FAT images can leave a directory inode with an incorrect\ni_nlink (e.g. 2 even though subdirectories exist). r…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 9894c79fd9466612d0514be157b5c30cd93aa645","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < cd569b87378b9c33ae13c23d6bb9d205d66f7c4b","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < d3b7ffa90f613938128432c7b2f35b7aa4bdd86b","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 955c5d670b5ae07c78f4345e23a895638db96ce1","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 17866f8a0822d414cb02e621cf003a7d04396ef8","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0","Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 8cafcb881364af5ef3a8b9fed4db254054033d8a","Linux 2.6.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:44:21.682551Z"},"published":"2026-05-27","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:53:12.556Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45915","references":[{"url":"https://git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115"},{"url":"https://git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645"},{"url":"https://git.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4b"},{"url":"https://git.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b"},{"url":"https://git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1"},{"url":"https://git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8"},{"url":"https://git.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0"},{"url":"https://git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a"}],"tags":["cve.org"],"epss":0.0016,"epssPercentile":0.0526,"ingestedAt":"2026-11-06T16:57:43.387Z","slug":"CVE-2026-45915","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfat: avoid parent link count underflow in rmdir\n\nCorrupted FAT images can leave a directory inode with an incorrect\ni_nlink (e.g. 2 even though subdirectories exist). rmdir then\nunconditionally calls drop_nlink(dir) and can drive i_nlink to 0,\ntriggering the WARN_ON in drop_nlink().\n\nAdd a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the\nparent link count when it is at least 3, otherwise report a filesystem\nerror.\n\n## Affected\n\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 9894c79fd9466612d0514be157b5c30cd93aa645`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < cd569b87378b9c33ae13c23d6bb9d205d66f7c4b`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < d3b7ffa90f613938128432c7b2f35b7aa4bdd86b`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 955c5d670b5ae07c78f4345e23a895638db96ce1`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 17866f8a0822d414cb02e621cf003a7d04396ef8`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0`\n- `Linux >= 9a53c3a783c2fa9b969628e65695c11c3e51e673 < 8cafcb881364af5ef3a8b9fed4db254054033d8a`\n- `Linux 2.6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}