{"api_version":"1","generated_at":"2026-08-17T11:24:49+00:00","cve":"CVE-2026-74522","urls":{"html":"https://cve.report/CVE-2026-74522","api":"https://cve.report/api/cve/CVE-2026-74522.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74522","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74522"},"summary":{"title":"ksmbd: fix use-after-free in __close_file_table_ids()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __close_file_table_ids()\n\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\n\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\n\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:57","updated_at":"2026-08-17 06:19:49"},"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:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","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:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66","name":"https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd","name":"https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459","name":"https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac","name":"https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f","name":"https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74522","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74522","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8510a043d334ecdf83d4604782f288db6bf21d60 67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8510a043d334ecdf83d4604782f288db6bf21d60 0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8510a043d334ecdf83d4604782f288db6bf21d60 9be4a66f019ea90bd9deca70511f4f9ffebf5c6f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8510a043d334ecdf83d4604782f288db6bf21d60 cffbdc86393b0235383a20c8c59bc32f16036459 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8510a043d334ecdf83d4604782f288db6bf21d60 e7188199eff46a636f3436356f0aae039be6dd66 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected df30cbfd3d8a70e61ce59f63ce5ed2261799ac10 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected aaf1d5ebb358f546414965b39da90107a7ca7ce5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.38 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.17.6 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74522","cve":"CVE-2026-74522","epss":"0.001680000","percentile":"0.064850000","score_date":"2026-08-16","updated_at":"2026-08-17 00:01:04"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/vfs_cache.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd","status":"affected","version":"8510a043d334ecdf83d4604782f288db6bf21d60","versionType":"git"},{"lessThan":"0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac","status":"affected","version":"8510a043d334ecdf83d4604782f288db6bf21d60","versionType":"git"},{"lessThan":"9be4a66f019ea90bd9deca70511f4f9ffebf5c6f","status":"affected","version":"8510a043d334ecdf83d4604782f288db6bf21d60","versionType":"git"},{"lessThan":"cffbdc86393b0235383a20c8c59bc32f16036459","status":"affected","version":"8510a043d334ecdf83d4604782f288db6bf21d60","versionType":"git"},{"lessThan":"e7188199eff46a636f3436356f0aae039be6dd66","status":"affected","version":"8510a043d334ecdf83d4604782f288db6bf21d60","versionType":"git"},{"status":"affected","version":"df30cbfd3d8a70e61ce59f63ce5ed2261799ac10","versionType":"git"},{"status":"affected","version":"aaf1d5ebb358f546414965b39da90107a7ca7ce5","versionType":"git"},{"lessThan":"5.16","status":"affected","version":"5.15.38","versionType":"semver"},{"lessThan":"5.18","status":"affected","version":"5.17.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/vfs_cache.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.18"},{"lessThan":"5.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.38","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __close_file_table_ids()\n\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\n\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\n\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - The bug is in ksmbd, the in-kernel SMB server reached remotely over TCP port 445 via SMB2 CREATE/CLOSE/SET_INFO rename and session teardown requests.\nAC:L - An attacker controls both sides of the race by issuing concurrent SMB2 CLOSE and rename operations on the same share, then logoff or disconnect; no victim-dependent timing or memory layout is required.\nPR:L - Exploitation requires a valid authenticated SMB session and share access to open, close, and rename files; it is not reachable on pre-authentication negotiate/echo paths.\nUI:N - No end-user action is required beyond the attacker driving SMB protocol operations on their own client connection(s).\nS:U - Impact is confined to kernel memory corruption and privilege escalation on the SMB server host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Use-after-free of a freed ksmbd_file slab object during session file-table teardown enables reading attacker-influenced heap contents and building arbitrary kernel memory read primitives.\nI:H - The UAF corrupts kernel heap metadata and ksmbd_file fields (pointers, list heads), enabling heap grooming and arbitrary write or control-flow hijack for code execution as root.\nA:H - The stale IDR entry is dereferenced during __close_file_table_ids() on logoff, tree disconnect, or connection teardown, causing kernel oops/panic and repeatable remote denial of service."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:14.517Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd"},{"url":"https://git.kernel.org/stable/c/0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac"},{"url":"https://git.kernel.org/stable/c/9be4a66f019ea90bd9deca70511f4f9ffebf5c6f"},{"url":"https://git.kernel.org/stable/c/cffbdc86393b0235383a20c8c59bc32f16036459"},{"url":"https://git.kernel.org/stable/c/e7188199eff46a636f3436356f0aae039be6dd66"}],"title":"ksmbd: fix use-after-free in __close_file_table_ids()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74522","datePublished":"2026-08-15T12:27:39.945Z","dateReserved":"2026-08-15T05:44:03.911Z","dateUpdated":"2026-08-17T05:48:14.517Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:57","lastModifiedDate":"2026-08-17 06:19:49","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:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74522","Ordinal":"1","Title":"ksmbd: fix use-after-free in __close_file_table_ids()","CVE":"CVE-2026-74522","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74522","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __close_file_table_ids()\n\nA ksmbd_file can remain alive after logical close while another session\nholds a temporary reference obtained through ksmbd_lookup_fd_inode().\nksmbd_close_fd() currently marks the file closed and drops the idr-owned\nreference, but leaves the pointer published in the closing session's idr\nuntil the final reference is dropped.\n\nIf the foreign holder performs the final ksmbd_fd_put(), __put_fd_final()\nsupplies the foreign session's file table to __ksmbd_close_fd(). The object\nis then freed without being removed from its owner's idr, and the owner\nsession later dereferences the stale pointer during file-table teardown.\n\nRemove the volatile id from the owner's idr while ksmbd_close_fd() still\nholds that table's lock, and clear volatile_id before dropping\nthe idr-owned reference. A later foreign final put then only performs\nphysical destruction and cannot remove the object from the wrong table.","Type":"Description","Title":"ksmbd: fix use-after-free in __close_file_table_ids()"}]}}}