{"api_version":"1","generated_at":"2026-10-04T10:14:32+00:00","cve":"CVE-2026-97564","urls":{"html":"https://cve.report/CVE-2026-97564","api":"https://cve.report/api/cve/CVE-2026-97564.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97564","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97564"},"summary":{"title":"smb: client: reject userspace cifs.idmap descriptions","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.idmap descriptions\n\ncifs.idmap key descriptions carry authority-bearing fields (owner and\ngroup SIDs and uid/gid values in \"os:\"/\"gs:\"/\"oi:\"/\"gi:\" form) that the\ncifs.idmap upcall helper treats as kernel-originating inputs.  Unlike\nits sibling cifs.spnego, the cifs.idmap key type has no vet_description\nhook, so userspace can create keys of this type through\nrequest_key(2)/add_key(2) and supply those fields without CIFS origin.\nA request_key(2) call with a non-NULL callout then drives a root\nusermodehelper upcall (/sbin/request-key -> cifs.idmap) that consumes\nthe unvetted description in root context.\n\nOnly accept cifs.idmap descriptions while CIFS is using its private\nroot_cred to request the key.  id_to_sid()/sid_to_id() already run\nunder override_creds(root_cred), so the kernel-originated path is\nunaffected.\n\nThis mirrors commit 3da1fdf4efbc (\"smb: client: reject userspace\ncifs.spnego descriptions\"), which applied the same restriction to\ncifs.spnego.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:07","updated_at":"2026-10-03 11:18:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1d3b24b16a0b013792e8f1e3ed060f0b46f537d1","name":"https://git.kernel.org/stable/c/1d3b24b16a0b013792e8f1e3ed060f0b46f537d1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e5964064e3fbe6325893408faff08ca33de0e2c3","name":"https://git.kernel.org/stable/c/e5964064e3fbe6325893408faff08ca33de0e2c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d9d7eeb0cea5b55b82888f443622fd8d4ee064f3","name":"https://git.kernel.org/stable/c/d9d7eeb0cea5b55b82888f443622fd8d4ee064f3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/17c93bcd17755523c21abb22cbf2a41a6eb0caaf","name":"https://git.kernel.org/stable/c/17c93bcd17755523c21abb22cbf2a41a6eb0caaf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a","name":"https://git.kernel.org/stable/c/f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/96751028c0d4dec785709ea3eb0ab38a4f2ded96","name":"https://git.kernel.org/stable/c/96751028c0d4dec785709ea3eb0ab38a4f2ded96","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97564","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97564","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d79dba0e00749fa40de8ef13a9b85ce57a1603b f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d79dba0e00749fa40de8ef13a9b85ce57a1603b 17c93bcd17755523c21abb22cbf2a41a6eb0caaf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d79dba0e00749fa40de8ef13a9b85ce57a1603b e5964064e3fbe6325893408faff08ca33de0e2c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d79dba0e00749fa40de8ef13a9b85ce57a1603b 96751028c0d4dec785709ea3eb0ab38a4f2ded96 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d79dba0e00749fa40de8ef13a9b85ce57a1603b 1d3b24b16a0b013792e8f1e3ed060f0b46f537d1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d79dba0e00749fa40de8ef13a9b85ce57a1603b d9d7eeb0cea5b55b82888f443622fd8d4ee064f3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"97564","cve":"CVE-2026-97564","epss":"0.002000000","percentile":"0.088990000","score_date":"2026-10-03","updated_at":"2026-10-04 00:03:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/cifsacl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a","status":"affected","version":"4d79dba0e00749fa40de8ef13a9b85ce57a1603b","versionType":"git"},{"lessThan":"17c93bcd17755523c21abb22cbf2a41a6eb0caaf","status":"affected","version":"4d79dba0e00749fa40de8ef13a9b85ce57a1603b","versionType":"git"},{"lessThan":"e5964064e3fbe6325893408faff08ca33de0e2c3","status":"affected","version":"4d79dba0e00749fa40de8ef13a9b85ce57a1603b","versionType":"git"},{"lessThan":"96751028c0d4dec785709ea3eb0ab38a4f2ded96","status":"affected","version":"4d79dba0e00749fa40de8ef13a9b85ce57a1603b","versionType":"git"},{"lessThan":"1d3b24b16a0b013792e8f1e3ed060f0b46f537d1","status":"affected","version":"4d79dba0e00749fa40de8ef13a9b85ce57a1603b","versionType":"git"},{"lessThan":"d9d7eeb0cea5b55b82888f443622fd8d4ee064f3","status":"affected","version":"4d79dba0e00749fa40de8ef13a9b85ce57a1603b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/cifsacl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.0"},{"lessThan":"3.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"3.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"3.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"3.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"3.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"3.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"3.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.idmap descriptions\n\ncifs.idmap key descriptions carry authority-bearing fields (owner and\ngroup SIDs and uid/gid values in \"os:\"/\"gs:\"/\"oi:\"/\"gi:\" form) that the\ncifs.idmap upcall helper treats as kernel-originating inputs.  Unlike\nits sibling cifs.spnego, the cifs.idmap key type has no vet_description\nhook, so userspace can create keys of this type through\nrequest_key(2)/add_key(2) and supply those fields without CIFS origin.\nA request_key(2) call with a non-NULL callout then drives a root\nusermodehelper upcall (/sbin/request-key -> cifs.idmap) that consumes\nthe unvetted description in root context.\n\nOnly accept cifs.idmap descriptions while CIFS is using its private\nroot_cred to request the key.  id_to_sid()/sid_to_id() already run\nunder override_creds(root_cred), so the kernel-originated path is\nunaffected.\n\nThis mirrors commit 3da1fdf4efbc (\"smb: client: reject userspace\ncifs.spnego descriptions\"), which applied the same restriction to\ncifs.spnego."}],"providerMetadata":{"dateUpdated":"2026-10-03T10:59:42.334Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a"},{"url":"https://git.kernel.org/stable/c/17c93bcd17755523c21abb22cbf2a41a6eb0caaf"},{"url":"https://git.kernel.org/stable/c/e5964064e3fbe6325893408faff08ca33de0e2c3"},{"url":"https://git.kernel.org/stable/c/96751028c0d4dec785709ea3eb0ab38a4f2ded96"},{"url":"https://git.kernel.org/stable/c/1d3b24b16a0b013792e8f1e3ed060f0b46f537d1"},{"url":"https://git.kernel.org/stable/c/d9d7eeb0cea5b55b82888f443622fd8d4ee064f3"}],"title":"smb: client: reject userspace cifs.idmap descriptions","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-97564","datePublished":"2026-09-25T10:21:51.858Z","dateReserved":"2026-09-24T16:01:01.155Z","dateUpdated":"2026-10-03T10:59:42.334Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:07","lastModifiedDate":"2026-10-03 11:18:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97564","Ordinal":"1","Title":"smb: client: reject userspace cifs.idmap descriptions","CVE":"CVE-2026-97564","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97564","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.idmap descriptions\n\ncifs.idmap key descriptions carry authority-bearing fields (owner and\ngroup SIDs and uid/gid values in \"os:\"/\"gs:\"/\"oi:\"/\"gi:\" form) that the\ncifs.idmap upcall helper treats as kernel-originating inputs.  Unlike\nits sibling cifs.spnego, the cifs.idmap key type has no vet_description\nhook, so userspace can create keys of this type through\nrequest_key(2)/add_key(2) and supply those fields without CIFS origin.\nA request_key(2) call with a non-NULL callout then drives a root\nusermodehelper upcall (/sbin/request-key -> cifs.idmap) that consumes\nthe unvetted description in root context.\n\nOnly accept cifs.idmap descriptions while CIFS is using its private\nroot_cred to request the key.  id_to_sid()/sid_to_id() already run\nunder override_creds(root_cred), so the kernel-originated path is\nunaffected.\n\nThis mirrors commit 3da1fdf4efbc (\"smb: client: reject userspace\ncifs.spnego descriptions\"), which applied the same restriction to\ncifs.spnego.","Type":"Description","Title":"smb: client: reject userspace cifs.idmap descriptions"}]}}}