{"api_version":"1","generated_at":"2026-07-20T14:42:59+00:00","cve":"CVE-2026-64108","urls":{"html":"https://cve.report/CVE-2026-64108","api":"https://cve.report/api/cve/CVE-2026-64108.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64108","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64108"},"summary":{"title":"cifs: Fix busy dentry used after unmounting","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix busy dentry used after unmounting\n\nSince commit 340cea84f691c (\"cifs: open files should not hold ref on\nsuperblock\"), cifs file only holds the dentry ref_cnt, the cifs file\nclose work(cfile->deferred) could be executed after unmounting, which\nwill trigger a warning in generic_shutdown_super:\n BUG: Dentry 00000000a14a6845{i=c,n=file}  still in use (1) [unmount of\n cifs cifs]\n\nThe detailed processs is:\n   process A           process B           kworker\n fd = open(PATH)\n  vfs_open\n   file->__f_path = *path // dentry->d_lockref.count = 1\n   cifs_open\n    cifs_new_fileinfo\n     cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2\n close(fd)\n  __fput\n  cifs_close\n   queue_delayed_work(deferredclose_wq, cfile->deferred)\n  dput(dentry) // dentry->d_lockref.count = 1\n\t\t\t                 smb2_deferred_work_close\n\t\t\t\t\t  _cifsFileInfo_put\n\t\t\t\t\t   list_del(&cifs_file->flist)\n                    umount\n\t\t     cleanup_mnt\n\t\t      deactivate_super\n\t\t       cifs_kill_sb\n\t\t        cifs_close_all_deferred_files_sb\n\t\t\t cifs_close_all_deferred_files\n\t\t\t  // cannot find cfile, skip _cifsFileInfo_put\n\t\t\tkill_anon_super\n\t\t\t generic_shutdown_super\n\t\t\t  shrink_dcache_for_umount\n\t\t\t   umount_check\n\t\t\t    WARN ! // dentry->d_lockref.count = 1\n\t\t\t\t\t   cifsFileInfo_put_final\n\t\t\t\t\t    dput(cifs_file->dentry)\n\t\t                            // dentry->d_lockref.count = 0\n\nFix it by flushing 'deferredclose_wq' before calling kill_anon_super.\n\nFetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:52","updated_at":"2026-07-19 16:17:52"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/c7364cea52531534676b9f7dbc0a477c11f4c050","name":"https://git.kernel.org/stable/c/c7364cea52531534676b9f7dbc0a477c11f4c050","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bdc349a87f1fb02c18c4071858a06542bfea783d","name":"https://git.kernel.org/stable/c/bdc349a87f1fb02c18c4071858a06542bfea783d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e1ffa6cf662383f95816eed1b623429d82675e75","name":"https://git.kernel.org/stable/c/e1ffa6cf662383f95816eed1b623429d82675e75","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c68337442f03953237a94577beb468ab2662a851","name":"https://git.kernel.org/stable/c/c68337442f03953237a94577beb468ab2662a851","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e7d9d0805e58fa3760894e73115b7a74024fd07","name":"https://git.kernel.org/stable/c/5e7d9d0805e58fa3760894e73115b7a74024fd07","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f2deaa2f409a4598eaa10f2a93a676c0632af248","name":"https://git.kernel.org/stable/c/f2deaa2f409a4598eaa10f2a93a676c0632af248","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64108","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64108","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 708c276f516d27beaded7f372ac8111cee43926c c7364cea52531534676b9f7dbc0a477c11f4c050 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0629a1a187e424373364d681b42b101894bdb548 bdc349a87f1fb02c18c4071858a06542bfea783d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd f2deaa2f409a4598eaa10f2a93a676c0632af248 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f655467a9973f964b267871e5fef533ad5014494 5e7d9d0805e58fa3760894e73115b7a74024fd07 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340cea84f691c5206561bb2e0147158fe02070be e1ffa6cf662383f95816eed1b623429d82675e75 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340cea84f691c5206561bb2e0147158fe02070be c68337442f03953237a94577beb468ab2662a851 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 30afc6ea72cc6cf7c8d579e79b64232801c38d08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.167 6.1.175 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.130 6.6.142 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.78 6.12.92 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.20 6.18.34 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.10 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.142 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.92 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/cifsfs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c7364cea52531534676b9f7dbc0a477c11f4c050","status":"affected","version":"708c276f516d27beaded7f372ac8111cee43926c","versionType":"git"},{"lessThan":"bdc349a87f1fb02c18c4071858a06542bfea783d","status":"affected","version":"0629a1a187e424373364d681b42b101894bdb548","versionType":"git"},{"lessThan":"f2deaa2f409a4598eaa10f2a93a676c0632af248","status":"affected","version":"0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd","versionType":"git"},{"lessThan":"5e7d9d0805e58fa3760894e73115b7a74024fd07","status":"affected","version":"f655467a9973f964b267871e5fef533ad5014494","versionType":"git"},{"lessThan":"e1ffa6cf662383f95816eed1b623429d82675e75","status":"affected","version":"340cea84f691c5206561bb2e0147158fe02070be","versionType":"git"},{"lessThan":"c68337442f03953237a94577beb468ab2662a851","status":"affected","version":"340cea84f691c5206561bb2e0147158fe02070be","versionType":"git"},{"status":"affected","version":"30afc6ea72cc6cf7c8d579e79b64232801c38d08","versionType":"git"},{"lessThan":"6.1.175","status":"affected","version":"6.1.167","versionType":"semver"},{"lessThan":"6.6.142","status":"affected","version":"6.6.130","versionType":"semver"},{"lessThan":"6.12.92","status":"affected","version":"6.12.78","versionType":"semver"},{"lessThan":"6.18.34","status":"affected","version":"6.18.20","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.10","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/cifsfs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.142","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"6.1.167","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.142","versionStartIncluding":"6.6.130","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.92","versionStartIncluding":"6.12.78","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"6.18.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix busy dentry used after unmounting\n\nSince commit 340cea84f691c (\"cifs: open files should not hold ref on\nsuperblock\"), cifs file only holds the dentry ref_cnt, the cifs file\nclose work(cfile->deferred) could be executed after unmounting, which\nwill trigger a warning in generic_shutdown_super:\n BUG: Dentry 00000000a14a6845{i=c,n=file}  still in use (1) [unmount of\n cifs cifs]\n\nThe detailed processs is:\n   process A           process B           kworker\n fd = open(PATH)\n  vfs_open\n   file->__f_path = *path // dentry->d_lockref.count = 1\n   cifs_open\n    cifs_new_fileinfo\n     cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2\n close(fd)\n  __fput\n  cifs_close\n   queue_delayed_work(deferredclose_wq, cfile->deferred)\n  dput(dentry) // dentry->d_lockref.count = 1\n\t\t\t                 smb2_deferred_work_close\n\t\t\t\t\t  _cifsFileInfo_put\n\t\t\t\t\t   list_del(&cifs_file->flist)\n                    umount\n\t\t     cleanup_mnt\n\t\t      deactivate_super\n\t\t       cifs_kill_sb\n\t\t        cifs_close_all_deferred_files_sb\n\t\t\t cifs_close_all_deferred_files\n\t\t\t  // cannot find cfile, skip _cifsFileInfo_put\n\t\t\tkill_anon_super\n\t\t\t generic_shutdown_super\n\t\t\t  shrink_dcache_for_umount\n\t\t\t   umount_check\n\t\t\t    WARN ! // dentry->d_lockref.count = 1\n\t\t\t\t\t   cifsFileInfo_put_final\n\t\t\t\t\t    dput(cifs_file->dentry)\n\t\t                            // dentry->d_lockref.count = 0\n\nFix it by flushing 'deferredclose_wq' before calling kill_anon_super.\n\nFetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:10.784Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c7364cea52531534676b9f7dbc0a477c11f4c050"},{"url":"https://git.kernel.org/stable/c/bdc349a87f1fb02c18c4071858a06542bfea783d"},{"url":"https://git.kernel.org/stable/c/f2deaa2f409a4598eaa10f2a93a676c0632af248"},{"url":"https://git.kernel.org/stable/c/5e7d9d0805e58fa3760894e73115b7a74024fd07"},{"url":"https://git.kernel.org/stable/c/e1ffa6cf662383f95816eed1b623429d82675e75"},{"url":"https://git.kernel.org/stable/c/c68337442f03953237a94577beb468ab2662a851"}],"title":"cifs: Fix busy dentry used after unmounting","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64108","datePublished":"2026-07-19T15:40:10.784Z","dateReserved":"2026-07-19T07:54:57.034Z","dateUpdated":"2026-07-19T15:40:10.784Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:52","lastModifiedDate":"2026-07-19 16:17:52","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64108","Ordinal":"1","Title":"cifs: Fix busy dentry used after unmounting","CVE":"CVE-2026-64108","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64108","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix busy dentry used after unmounting\n\nSince commit 340cea84f691c (\"cifs: open files should not hold ref on\nsuperblock\"), cifs file only holds the dentry ref_cnt, the cifs file\nclose work(cfile->deferred) could be executed after unmounting, which\nwill trigger a warning in generic_shutdown_super:\n BUG: Dentry 00000000a14a6845{i=c,n=file}  still in use (1) [unmount of\n cifs cifs]\n\nThe detailed processs is:\n   process A           process B           kworker\n fd = open(PATH)\n  vfs_open\n   file->__f_path = *path // dentry->d_lockref.count = 1\n   cifs_open\n    cifs_new_fileinfo\n     cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2\n close(fd)\n  __fput\n  cifs_close\n   queue_delayed_work(deferredclose_wq, cfile->deferred)\n  dput(dentry) // dentry->d_lockref.count = 1\n\t\t\t                 smb2_deferred_work_close\n\t\t\t\t\t  _cifsFileInfo_put\n\t\t\t\t\t   list_del(&cifs_file->flist)\n                    umount\n\t\t     cleanup_mnt\n\t\t      deactivate_super\n\t\t       cifs_kill_sb\n\t\t        cifs_close_all_deferred_files_sb\n\t\t\t cifs_close_all_deferred_files\n\t\t\t  // cannot find cfile, skip _cifsFileInfo_put\n\t\t\tkill_anon_super\n\t\t\t generic_shutdown_super\n\t\t\t  shrink_dcache_for_umount\n\t\t\t   umount_check\n\t\t\t    WARN ! // dentry->d_lockref.count = 1\n\t\t\t\t\t   cifsFileInfo_put_final\n\t\t\t\t\t    dput(cifs_file->dentry)\n\t\t                            // dentry->d_lockref.count = 0\n\nFix it by flushing 'deferredclose_wq' before calling kill_anon_super.\n\nFetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.","Type":"Description","Title":"cifs: Fix busy dentry used after unmounting"}]}}}