{"api_version":"1","generated_at":"2026-06-04T13:01:14+00:00","cve":"CVE-2026-45915","urls":{"html":"https://cve.report/CVE-2026-45915","api":"https://cve.report/api/cve/CVE-2026-45915.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45915","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45915"},"summary":{"title":"fat: avoid parent link count underflow in rmdir","description":"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). 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:06","updated_at":"2026-05-27 14:48:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8","name":"https://git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645","name":"https://git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b","name":"https://git.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4b","name":"https://git.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a","name":"https://git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1","name":"https://git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0","name":"https://git.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115","name":"https://git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45915","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45915","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 9894c79fd9466612d0514be157b5c30cd93aa645 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 cd569b87378b9c33ae13c23d6bb9d205d66f7c4b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 d3b7ffa90f613938128432c7b2f35b7aa4bdd86b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.202 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.165 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.128 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.75 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.14 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.4 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"45915","cve":"CVE-2026-45915","epss":"0.000240000","percentile":"0.073320000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:21"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/fat/namei_msdos.c","fs/fat/namei_vfat.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7fe0de287e931e07cb96ecf1f449b2ebdb0e1115","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"9894c79fd9466612d0514be157b5c30cd93aa645","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"cd569b87378b9c33ae13c23d6bb9d205d66f7c4b","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"d3b7ffa90f613938128432c7b2f35b7aa4bdd86b","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"955c5d670b5ae07c78f4345e23a895638db96ce1","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"17866f8a0822d414cb02e621cf003a7d04396ef8","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"},{"lessThan":"8cafcb881364af5ef3a8b9fed4db254054033d8a","status":"affected","version":"9a53c3a783c2fa9b969628e65695c11c3e51e673","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/fat/namei_msdos.c","fs/fat/namei_vfat.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.19"},{"lessThan":"2.6.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.252","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.202","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.165","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.128","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.75","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.14","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.252","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.202","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.165","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.128","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.75","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.14","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.4","versionStartIncluding":"2.6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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). 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."}],"providerMetadata":{"dateUpdated":"2026-05-27T12:17:30.699Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"fat: avoid parent link count underflow in rmdir","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-45915","datePublished":"2026-05-27T12:17:30.699Z","dateReserved":"2026-05-13T15:03:33.085Z","dateUpdated":"2026-05-27T12:17:30.699Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:06","lastModifiedDate":"2026-05-27 14:48:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45915","Ordinal":"1","Title":"fat: avoid parent link count underflow in rmdir","CVE":"CVE-2026-45915","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45915","Ordinal":"1","NoteData":"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). 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.","Type":"Description","Title":"fat: avoid parent link count underflow in rmdir"}]}}}