CVE-2026-64108

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64108", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.034Z", "datePublished": "2026-07-19T15:40:10.784Z", "dateUpdated": "2026-08-05T12:39:17.918Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:17.918Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached through local VFS syscalls (open, close, umount) in the CIFS client mount teardown path, not through remote packet handling or in-kernel SMB server code.\nAC:L - An attacker controls both sides of the race by opening/closing files to queue deferred-close work (default 1-second closetimeo) and concurrently triggering umount, and can retry until the window is hit.\nPR:L - Exploitation requires only an unprivileged local user with access to files on an already-mounted CIFS/SMB3 share; mount/umount can be supplied by the attacker in a separate thread if they hold CAP_SYS_ADMIN, or by autofs/system umount on shared enterprise mounts.\nUI:N - No victim interaction is required; the attacker drives the open/close/umount syscall sequence directly without relying on another user to open files or click anything.\nS:U - Impact is confined to kernel memory corruption and privilege boundaries within the same host; this is not a VM escape, sandbox escape, or cross-security-authority boundary flaw.\nC:H - The deferred-close worker performs use-after-free on dentry, inode, and super_block structures after unmount teardown, which can be leveraged for arbitrary kernel memory read per standard UAF guidance.\nI:H - Post-unmount _cifsFileInfo_put() and cifsFileInfo_put_final() operate on freed kernel objects and can corrupt heap metadata or control flow, enabling arbitrary write or code execution primitives.\nA:H - The race triggers a WARN in generic_shutdown_super during umount and subsequent use-after-free in the deferred-close worker can cause kernel oops, panic, or hang."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/cifsfs.c"], "versions": [{"version": "708c276f516d27beaded7f372ac8111cee43926c", "lessThan": "c7364cea52531534676b9f7dbc0a477c11f4c050", "status": "affected", "versionType": "git"}, {"version": "0629a1a187e424373364d681b42b101894bdb548", "lessThan": "bdc349a87f1fb02c18c4071858a06542bfea783d", "status": "affected", "versionType": "git"}, {"version": "0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd", "lessThan": "f2deaa2f409a4598eaa10f2a93a676c0632af248", "status": "affected", "versionType": "git"}, {"version": "f655467a9973f964b267871e5fef533ad5014494", "lessThan": "5e7d9d0805e58fa3760894e73115b7a74024fd07", "status": "affected", "versionType": "git"}, {"version": "340cea84f691c5206561bb2e0147158fe02070be", "lessThan": "e1ffa6cf662383f95816eed1b623429d82675e75", "status": "affected", "versionType": "git"}, {"version": "340cea84f691c5206561bb2e0147158fe02070be", "lessThan": "c68337442f03953237a94577beb468ab2662a851", "status": "affected", "versionType": "git"}, {"version": "30afc6ea72cc6cf7c8d579e79b64232801c38d08", "status": "affected", "versionType": "git"}, {"version": "6.1.167", "lessThan": "6.1.175", "status": "affected", "versionType": "semver"}, {"version": "6.6.130", "lessThan": "6.6.142", "status": "affected", "versionType": "semver"}, {"version": "6.12.78", "lessThan": "6.12.92", "status": "affected", "versionType": "semver"}, {"version": "6.18.20", "lessThan": "6.18.34", "status": "affected", "versionType": "semver"}, {"version": "6.19.10", "lessThan": "6.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/cifsfs.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.167", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.130", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.78", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.20", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.10"}]}]}], "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"}}}}

{}

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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."}], "id": "CVE-2026-64108", "lastModified": "2026-08-12T15:14:14.520", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:52.100", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e7d9d0805e58fa3760894e73115b7a74024fd07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bdc349a87f1fb02c18c4071858a06542bfea783d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c68337442f03953237a94577beb468ab2662a851"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7364cea52531534676b9f7dbc0a477c11f4c050"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1ffa6cf662383f95816eed1b623429d82675e75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f2deaa2f409a4598eaa10f2a93a676c0632af248"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cifs: Fix busy dentry used after unmounting", "id": "2502562", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502562"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's Common Internet File System (CIFS) component. This vulnerability occurs when a CIFS file's close operation is executed after the filesystem has been unmounted, leading to a directory entry (dentry) remaining in use. This improper resource management can trigger a system warning and potentially lead to system instability or a denial of service (DoS) condition, where legitimate users may be unable to access system resources."], "name": "CVE-2026-64108", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64108\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64108\nhttps://lore.kernel.org/linux-cve-announce/2026071921-CVE-2026-64108-b278@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[708c276f516d27beaded7f372ac8111cee43926c,c7364cea52531534676b9f7dbc0a477c11f4c050)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0629a1a187e424373364d681b42b101894bdb548,bdc349a87f1fb02c18c4071858a06542bfea783d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd,f2deaa2f409a4598eaa10f2a93a676c0632af248)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f655467a9973f964b267871e5fef533ad5014494,5e7d9d0805e58fa3760894e73115b7a74024fd07)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[340cea84f691c5206561bb2e0147158fe02070be,e1ffa6cf662383f95816eed1b623429d82675e75)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[340cea84f691c5206561bb2e0147158fe02070be,c68337442f03953237a94577beb468ab2662a851)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "30afc6ea72cc6cf7c8d579e79b64232801c38d08"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.167,6.1.175)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.130,6.6.142)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.78,6.12.92)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.20,6.18.34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.142,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.92,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T10:00:04.564101+00:00", "updated": "2026-08-13T12:00:05.175025+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}