Answer in brief
CVE-2026-64108 records a Unknown severity vulnerability in cifs: Fix busy dentry used after unmounting. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=708c276f516d27beaded7f372ac8111cee43926c <c7364cea52531534676b9f7dbc0a477c11f4c050 || >=0629a1a187e424373364d681b42b101894bdb548 <bdc349a87f1fb02c18c4071858a06542bfea783d || >=0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd <f2deaa2f409a4598eaa10f2a93a676c0632af248 || >=f655467a9973f964b267871e5fef533ad5014494 <5e7d9d0805e58fa3760894e73115b7a74024fd07 || >=340cea84f691c5206561bb2e0147158fe02070be <e1ffa6cf662383f95816eed1b623429d82675e75 || >=340cea84f691c5206561bb2e0147158fe02070be <c68337442f03953237a94577beb468ab2662a851 || 30afc6ea72cc6cf7c8d579e79b64232801c38d08 || >=6.1.167 <6.1.175 || >=6.6.130 <6.6.142 || >=6.12.78 <6.12.92 || >=6.18.20 <6.18.34 || >=6.19.10 <6.20 | c7364cea52531534676b9f7dbc0a477c11f4c050, bdc349a87f1fb02c18c4071858a06542bfea783d, f2deaa2f409a4598eaa10f2a93a676c0632af248, 5e7d9d0805e58fa3760894e73115b7a74024fd07, e1ffa6cf662383f95816eed1b623429d82675e75, c68337442f03953237a94577beb468ab2662a851, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 6.20 |
| Linux/Linuxgeneric | 7.0 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c ("cifs: open files should not hold ref on superblock"), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile->deferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super: BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of cifs cifs] The detailed processs is: process A process B kworker fd = open(PATH) vfs_open file->__f_path = *path // dentry->d_lockref.count = 1 cifs_open cifs_new_fileinfo cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2 close(fd) __fput cifs_close queue_delayed_work(deferredclose_wq, cfile->deferred) dput(dentry) // dentry->d_lockref.count = 1 smb2_deferred_work_close _cifsFileInfo_put list_del(&cifs_file->flist) umount cleanup_mnt deactivate_super cifs_kill_sb cifs_close_all_deferred_files_sb cifs_close_all_deferred_files // cannot find cfile, skip _cifsFileInfo_put kill_anon_super generic_shutdown_super shrink_dcache_for_umount umount_check WARN ! // dentry->d_lockref.count = 1 cifsFileInfo_put_final dput(cifs_file->dentry) // dentry->d_lockref.count = 0 Fix it by flushing 'deferredclose_wq' before calling kill_anon_super. Fetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-64108 records a Unknown severity vulnerability in cifs: Fix busy dentry used after unmounting. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=708c276f516d27beaded7f372ac8111cee43926c <c7364cea52531534676b9f7dbc0a477c11f4c050 || >=0629a1a187e424373364d681b42b101894bdb548 <bdc349a87f1fb02c18c4071858a06542bfea783d || >=0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd <f2deaa2f409a4598eaa10f2a93a676c0632af248 || >=f655467a9973f964b267871e5fef533ad5014494 <5e7d9d0805e58fa3760894e73115b7a74024fd07 || >=340cea84f691c5206561bb2e0147158fe02070be <e1ffa6cf662383f95816eed1b623429d82675e75 || >=340cea84f691c5206561bb2e0147158fe02070be <c68337442f03953237a94577beb468ab2662a851 || 30afc6ea72cc6cf7c8d579e79b64232801c38d08 || >=6.1.167 <6.1.175 || >=6.6.130 <6.6.142 || >=6.12.78 <6.12.92 || >=6.18.20 <6.18.34 || >=6.19.10 <6.20 | c7364cea52531534676b9f7dbc0a477c11f4c050, bdc349a87f1fb02c18c4071858a06542bfea783d, f2deaa2f409a4598eaa10f2a93a676c0632af248, 5e7d9d0805e58fa3760894e73115b7a74024fd07, e1ffa6cf662383f95816eed1b623429d82675e75, c68337442f03953237a94577beb468ab2662a851, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 6.20 |
| Linux/Linuxgeneric | 7.0 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c ("cifs: open files should not hold ref on superblock"), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile->deferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super: BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of cifs cifs] The detailed processs is: process A process B kworker fd = open(PATH) vfs_open file->__f_path = *path // dentry->d_lockref.count = 1 cifs_open cifs_new_fileinfo cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2 close(fd) __fput cifs_close queue_delayed_work(deferredclose_wq, cfile->deferred) dput(dentry) // dentry->d_lockref.count = 1 smb2_deferred_work_close _cifsFileInfo_put list_del(&cifs_file->flist) umount cleanup_mnt deactivate_super cifs_kill_sb cifs_close_all_deferred_files_sb cifs_close_all_deferred_files // cannot find cfile, skip _cifsFileInfo_put kill_anon_super generic_shutdown_super shrink_dcache_for_umount umount_check WARN ! // dentry->d_lockref.count = 1 cifsFileInfo_put_final dput(cifs_file->dentry) // dentry->d_lockref.count = 0 Fix it by flushing 'deferredclose_wq' before calling kill_anon_super. Fetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.
Quoted source text, attributed separately from HOL analysis.