{ "cveId": "CVE-2026-72315", "url": "https://patchblox.com/security/cve/CVE-2026-72315", "summary": "CVE-2026-72315 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-72315, released August 15, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "smb: client: fix busy dentry warning on unmount after DIO", "description": "In the Linux kernel, the following vulnerability has been resolved: smb: client: fix busy dentry warning on unmount after DIO Commit c68337442f03 (\u0022cifs: Fix busy dentry used after unmounting\u0022) fixed the issue in cifs where deferred close of a file led to a dentry reference count not being released in umount, by flushing deferredclose_wq in cifs_kill_sb() to solve it. However, the cifs DIO path suffers from the same busy-dentry problem caused by a delayed dentry reference-count release: \t[dio]\t\t\t[cifsd]\t\t\t[close \u002B umount] netfs_unbuffered_write_iter_locked ... \t\t\t\tcifs_demultiplex_thread netfs_unbuffered_write cifs_issue_write netfs_wait_for_in_progress_stream [1] \t\t\t\t... \t\t\t\t netfs_write_subrequest_terminated \t\t\t\t netfs_subreq_clear_in_progress \t\t\t\t netfs_wake_collector // wake [1] \t\t\t\t netfs_put_subrequest netfs_put_request queue_work(system_dfl_wq, xxx) [2] // dio write return\t\t\t\t\tcifs_close \t\t\t\t\t\t\t _cifsFileInfo_put \t\t\t\t\t\t\t // cfile-\u003Ecount 2-\u003E1 \t\t\t\t\t\t\t --cfile-\u003Ecount [3] \t\t\t\t\t\t\t// umount \t\t\t\t\t\t\tcifs_kill_sb \t\t\t\t\t\t\t kill_anon_super \t\t\t\t\t\t\t // warning triggered! \t\t\t\t\t\t\t shrink_dcache_for_umount [4] [system_dfl_wq] [5] netfs_free_request ... _cifsFileInfo_put // cfile-\u003Ecount 1-\u003E0 --cfile-\u003Ecount queue_work(fileinfo_put_wq, xxx) [fileinfo_put_wq] [6] cifsFileInfo_put_work cifsFileInfo_put_final dput If the umount path is triggered before [5], it results warning: BUG: Dentry 00000000eab1f070{i=9a917b66ae404fec,n=test} still in use (1) [unmount of cifs cifs] The existing per-inode ictx-\u003Eio_count wait in cifs_evict_inode() does not help: it lives in the inode eviction path, which runs after shrink_dcache_for_umount() has already warned about the busy dentries. Fix it by adding a per-superblock outstanding-rreq counter that is incremented in cifs_init_request() and decremented in cifs_free_request(). In cifs_kill_sb(), before kill_anon_super(), wait for this counter to reach 0 - which guarantees that all cleanup_work for this sb have run and thus all relevant cfile puts are queued on fileinfo_put_wq or serverclose_wq. Then drain the workqueue so the dentry refs are dropped. This is a targeted wait, not a flush of the system-wide system_dfl_wq.", "published": "2026-08-15T06:22:04Z", "severity": "Low", "cvss": 7.8, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00175, "epssPercentile": 0.07062, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72315", "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "bpftool6.12-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.12.113-138.209.amzn2023", "fix": "ALAS2023-2026-3335", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", 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