{"api_version":"1","generated_at":"2026-10-27T03:18:18+00:00","cve":"CVE-2026-98451","urls":{"html":"https://cve.report/CVE-2026-98451","api":"https://cve.report/api/cve/CVE-2026-98451.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98451","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98451"},"summary":{"title":"smb: client: use finish_no_open() for non-regular inodes","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: use finish_no_open() for non-regular inodes\n\nAn O_CREAT open can find an existing symlink or another non-regular\ninode. cifs_atomic_open() calls finish_open() on it and attaches a\ncifsFileInfo. Symlink inodes have no CIFS release operation, so the\ndentry reference held by cifsFileInfo is leaked. FMODE_OPENED also\nprevents the VFS from following the symlink.\n\nTrack whether cifs_do_create() returned an open server handle. For\nnon-regular inodes, close the handle if present, remove the pending\nopen, and call finish_no_open() so the VFS can continue the lookup.\nDo not set FMODE_CREATED unless a regular file was opened. For\nO_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's\n-EFTYPE check.\n\nDefer closing a legacy POSIX handle on a non-regular inode until\nafter inode lookup. This avoids closing it again if lookup fails.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:16:55","updated_at":"2026-10-24 14:16:42"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/70a7918fda54a06d836acc91eb9a3c7e860fe0a0","name":"https://git.kernel.org/stable/c/70a7918fda54a06d836acc91eb9a3c7e860fe0a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e66cf1625ec4a3fe68346119f371def713fd0a4d","name":"https://git.kernel.org/stable/c/e66cf1625ec4a3fe68346119f371def713fd0a4d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ed03d547598c92a036f20e89156540995cac889a","name":"https://git.kernel.org/stable/c/ed03d547598c92a036f20e89156540995cac889a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/045532f920d86dd76600b635f9756e5fd671ddfc","name":"https://git.kernel.org/stable/c/045532f920d86dd76600b635f9756e5fd671ddfc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3c07deb26273155c180aedfd9041ab58015d2521","name":"https://git.kernel.org/stable/c/3c07deb26273155c180aedfd9041ab58015d2521","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98451","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98451","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d2c127197dfc0b2bae62a52e1e0d3e3ff493919e 045532f920d86dd76600b635f9756e5fd671ddfc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d2c127197dfc0b2bae62a52e1e0d3e3ff493919e ed03d547598c92a036f20e89156540995cac889a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d2c127197dfc0b2bae62a52e1e0d3e3ff493919e 70a7918fda54a06d836acc91eb9a3c7e860fe0a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d2c127197dfc0b2bae62a52e1e0d3e3ff493919e 3c07deb26273155c180aedfd9041ab58015d2521 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d2c127197dfc0b2bae62a52e1e0d3e3ff493919e e66cf1625ec4a3fe68346119f371def713fd0a4d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.160 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.56 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98451","cve":"CVE-2026-98451","epss":"0.001680000","percentile":"0.057460000","score_date":"2026-10-21","updated_at":"2026-10-22 00:15:10"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/dir.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"045532f920d86dd76600b635f9756e5fd671ddfc","status":"affected","version":"d2c127197dfc0b2bae62a52e1e0d3e3ff493919e","versionType":"git"},{"lessThan":"ed03d547598c92a036f20e89156540995cac889a","status":"affected","version":"d2c127197dfc0b2bae62a52e1e0d3e3ff493919e","versionType":"git"},{"lessThan":"70a7918fda54a06d836acc91eb9a3c7e860fe0a0","status":"affected","version":"d2c127197dfc0b2bae62a52e1e0d3e3ff493919e","versionType":"git"},{"lessThan":"3c07deb26273155c180aedfd9041ab58015d2521","status":"affected","version":"d2c127197dfc0b2bae62a52e1e0d3e3ff493919e","versionType":"git"},{"lessThan":"e66cf1625ec4a3fe68346119f371def713fd0a4d","status":"affected","version":"d2c127197dfc0b2bae62a52e1e0d3e3ff493919e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/dir.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.6"},{"lessThan":"3.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.160","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.56","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"3.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"3.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.56","versionStartIncluding":"3.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"3.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"3.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: use finish_no_open() for non-regular inodes\n\nAn O_CREAT open can find an existing symlink or another non-regular\ninode. cifs_atomic_open() calls finish_open() on it and attaches a\ncifsFileInfo. Symlink inodes have no CIFS release operation, so the\ndentry reference held by cifsFileInfo is leaked. FMODE_OPENED also\nprevents the VFS from following the symlink.\n\nTrack whether cifs_do_create() returned an open server handle. For\nnon-regular inodes, close the handle if present, remove the pending\nopen, and call finish_no_open() so the VFS can continue the lookup.\nDo not set FMODE_CREATED unless a regular file was opened. For\nO_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's\n-EFTYPE check.\n\nDefer closing a legacy POSIX handle on a non-regular inode until\nafter inode lookup. This avoids closing it again if lookup fails."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - `openat(O_CREAT)` reaches `cifs_atomic_open()` and `cifs_do_create()`; a remote SMB2 server can return a CREATE/reparse response identifying the object as `IO_REPARSE_TAG_LX_FIFO`, so the causative inode type arrives over routable SMB.\nAC:L - The server can return a FIFO for any fresh, uncached requested name; after the victim's O_CREAT, `finish_open()` and `cifs_new_fileinfo()` deterministically create the type confusion without a race or an uncontrollable precondition.\nPR:N - A malicious SMB endpoint needs no account or capability on the client; the SMB session authenticates the victim outward to the server, which directly controls the CREATE and reparse responses.\nUI:R - The remote server cannot initiate `cifs_atomic_open()` itself; a victim must mount or access its share and issue an O_CREAT open, after which the server can substitute the non-regular inode response.\nS:U - The confused `cifsFileInfo` and resulting pipe operations execute within the vulnerable client's kernel security authority and do not cross a VM, IOMMU, or other security boundary.\nC:H - `cifs_set_ops()` installs `pipefifo_fops`, but `finish_open(..., generic_file_open)` skips `fifo_open()` and `cifs_new_fileinfo()` puts a `cifsFileInfo` in `private_data`; `fifo_pipe_read()` then treats its fields as pipe buffers and pages, creating disclosure-capable type confusion.\nI:H - `pipe_release()` and `pipe_resize_ring()` treat the `cifsFileInfo` as `pipe_inode_info`, modifying fake mutex, counter, waitqueue, and buffer-pointer fields and potentially freeing the misinterpreted `pipe->bufs`, providing kernel-memory corruption primitives.\nA:H - Closing the returned FIFO fd invokes `pipe_release()` on the `cifsFileInfo`; locking its list pointers as a pipe mutex and accessing fake pipe state can immediately oops or hang the kernel, beyond the separate symlink reference leak."}]}],"providerMetadata":{"dateUpdated":"2026-10-24T14:08:53.021Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/045532f920d86dd76600b635f9756e5fd671ddfc"},{"url":"https://git.kernel.org/stable/c/ed03d547598c92a036f20e89156540995cac889a"},{"url":"https://git.kernel.org/stable/c/70a7918fda54a06d836acc91eb9a3c7e860fe0a0"},{"url":"https://git.kernel.org/stable/c/3c07deb26273155c180aedfd9041ab58015d2521"},{"url":"https://git.kernel.org/stable/c/e66cf1625ec4a3fe68346119f371def713fd0a4d"}],"title":"smb: client: use finish_no_open() for non-regular inodes","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98451","datePublished":"2026-10-18T15:15:01.473Z","dateReserved":"2026-09-25T10:25:14.350Z","dateUpdated":"2026-10-24T14:08:53.021Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:16:55","lastModifiedDate":"2026-10-24 14:16:42","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98451","Ordinal":"1","Title":"smb: client: use finish_no_open() for non-regular inodes","CVE":"CVE-2026-98451","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98451","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: use finish_no_open() for non-regular inodes\n\nAn O_CREAT open can find an existing symlink or another non-regular\ninode. cifs_atomic_open() calls finish_open() on it and attaches a\ncifsFileInfo. Symlink inodes have no CIFS release operation, so the\ndentry reference held by cifsFileInfo is leaked. FMODE_OPENED also\nprevents the VFS from following the symlink.\n\nTrack whether cifs_do_create() returned an open server handle. For\nnon-regular inodes, close the handle if present, remove the pending\nopen, and call finish_no_open() so the VFS can continue the lookup.\nDo not set FMODE_CREATED unless a regular file was opened. For\nO_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's\n-EFTYPE check.\n\nDefer closing a legacy POSIX handle on a non-regular inode until\nafter inode lookup. This avoids closing it again if lookup fails.","Type":"Description","Title":"smb: client: use finish_no_open() for non-regular inodes"}]}}}