{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-64108", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64108", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-07-19T15:40:10.784Z", "updatedAt": "2026-08-05T12:39:17.918Z", "importedAt": "2026-10-24T01:58:25.636Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "cifs: Fix busy dentry used after unmounting", "summary": "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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "708c276f516d27beaded7f372ac8111cee43926c", "status": "affected", "versionType": "git", "lessThan": "c7364cea52531534676b9f7dbc0a477c11f4c050" }, { "version": "0629a1a187e424373364d681b42b101894bdb548", "status": "affected", "versionType": "git", "lessThan": "bdc349a87f1fb02c18c4071858a06542bfea783d" }, { "version": "0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd", "status": "affected", "versionType": "git", "lessThan": "f2deaa2f409a4598eaa10f2a93a676c0632af248" }, { "version": "f655467a9973f964b267871e5fef533ad5014494", "status": "affected", "versionType": "git", "lessThan": "5e7d9d0805e58fa3760894e73115b7a74024fd07" }, { "version": "340cea84f691c5206561bb2e0147158fe02070be", "status": "affected", "versionType": "git", "lessThan": "e1ffa6cf662383f95816eed1b623429d82675e75" }, { "version": "340cea84f691c5206561bb2e0147158fe02070be", "status": "affected", "versionType": "git", "lessThan": "c68337442f03953237a94577beb468ab2662a851" }, { "version": "30afc6ea72cc6cf7c8d579e79b64232801c38d08", "status": "affected", "versionType": "git" }, { "version": "6.1.167", "status": "affected", "versionType": "semver", "lessThan": "6.1.175" }, { "version": "6.6.130", "status": "affected", "versionType": "semver", "lessThan": "6.6.142" }, { "version": "6.12.78", "status": "affected", "versionType": "semver", "lessThan": "6.12.92" }, { "version": "6.18.20", "status": "affected", "versionType": "semver", "lessThan": "6.18.34" }, { "version": "6.19.10", "status": "affected", "versionType": "semver", "lessThan": "6.20" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "7.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "7.0" }, { "version": "6.1.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.142", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.92", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.34", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.0.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }