{"api_version":"1","generated_at":"2026-09-17T23:31:14+00:00","cve":"CVE-2026-90153","urls":{"html":"https://cve.report/CVE-2026-90153","api":"https://cve.report/api/cve/CVE-2026-90153.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90153","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90153"},"summary":{"title":"ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: bound smb_check_perm_dacl() ACE walks by DACL size\n\nsmb_check_perm_dacl() validates that the DACL fits inside the NT\nsecurity descriptor, but then bounds its two ACE walks by the\nremaining NTSD length (acl_size) rather than the DACL's declared\nsize (pdacl_size).\n\nWhen pdacl->size is smaller than the trailing NTSD buffer, bytes\nafter the declared DACL boundary - still inside the stored security\ndescriptor - are parsed as ACEs during access checks.  A crafted\nDACL can place an access-granting ACE beyond pdacl->size, and the\ncurrent code accepts it during SMB2_CREATE access validation, while\nparse_dacl() and smb_inherit_dacl() stop at pdacl_size.\n\nBound both ACE walks by pdacl_size to match the DACL boundary\nsemantics used elsewhere in the server.\n\nValidation:\n- semantic KUnit harness shows the post-boundary ACE is selected\n  before the fix and rejected (EACCES) after it\n- linux master (7.2-rc6), x86_64","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:08","updated_at":"2026-09-17 17:17:08"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a4a307d149327dad5fb25187e1b03cebd1b04de6","name":"https://git.kernel.org/stable/c/a4a307d149327dad5fb25187e1b03cebd1b04de6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/79decd88dd3f0d42e7fb0689b1a7853bfa302459","name":"https://git.kernel.org/stable/c/79decd88dd3f0d42e7fb0689b1a7853bfa302459","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a29f57a14c939586d84d7fd6a029bd1fd170098f","name":"https://git.kernel.org/stable/c/a29f57a14c939586d84d7fd6a029bd1fd170098f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67","name":"https://git.kernel.org/stable/c/8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a2051ffe452afad52f580b85a3fd8851933b1e7c","name":"https://git.kernel.org/stable/c/a2051ffe452afad52f580b85a3fd8851933b1e7c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90153","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90153","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f0541186e9ad1b62accc9519cc2b7a7240272a7 a2051ffe452afad52f580b85a3fd8851933b1e7c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f0541186e9ad1b62accc9519cc2b7a7240272a7 a29f57a14c939586d84d7fd6a029bd1fd170098f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f0541186e9ad1b62accc9519cc2b7a7240272a7 a4a307d149327dad5fb25187e1b03cebd1b04de6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f0541186e9ad1b62accc9519cc2b7a7240272a7 8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f0541186e9ad1b62accc9519cc2b7a7240272a7 79decd88dd3f0d42e7fb0689b1a7853bfa302459 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cb69d4d6f709f87c94afa28ae64c501576692171 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6e8f4abf584253cbaa596ea4ad13110cf61cd4c9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e33102309bd6839b2e2e158f93a7b378cb4655d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.62 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18.18 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19.2 5.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/smbacl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a2051ffe452afad52f580b85a3fd8851933b1e7c","status":"affected","version":"8f0541186e9ad1b62accc9519cc2b7a7240272a7","versionType":"git"},{"lessThan":"a29f57a14c939586d84d7fd6a029bd1fd170098f","status":"affected","version":"8f0541186e9ad1b62accc9519cc2b7a7240272a7","versionType":"git"},{"lessThan":"a4a307d149327dad5fb25187e1b03cebd1b04de6","status":"affected","version":"8f0541186e9ad1b62accc9519cc2b7a7240272a7","versionType":"git"},{"lessThan":"8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67","status":"affected","version":"8f0541186e9ad1b62accc9519cc2b7a7240272a7","versionType":"git"},{"lessThan":"79decd88dd3f0d42e7fb0689b1a7853bfa302459","status":"affected","version":"8f0541186e9ad1b62accc9519cc2b7a7240272a7","versionType":"git"},{"status":"affected","version":"cb69d4d6f709f87c94afa28ae64c501576692171","versionType":"git"},{"status":"affected","version":"6e8f4abf584253cbaa596ea4ad13110cf61cd4c9","versionType":"git"},{"status":"affected","version":"8e33102309bd6839b2e2e158f93a7b378cb4655d","versionType":"git"},{"lessThan":"5.16","status":"affected","version":"5.15.62","versionType":"semver"},{"lessThan":"5.19","status":"affected","version":"5.18.18","versionType":"semver"},{"lessThan":"5.20","status":"affected","version":"5.19.2","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/smbacl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.0"},{"lessThan":"6.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.62","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: bound smb_check_perm_dacl() ACE walks by DACL size\n\nsmb_check_perm_dacl() validates that the DACL fits inside the NT\nsecurity descriptor, but then bounds its two ACE walks by the\nremaining NTSD length (acl_size) rather than the DACL's declared\nsize (pdacl_size).\n\nWhen pdacl->size is smaller than the trailing NTSD buffer, bytes\nafter the declared DACL boundary - still inside the stored security\ndescriptor - are parsed as ACEs during access checks.  A crafted\nDACL can place an access-granting ACE beyond pdacl->size, and the\ncurrent code accepts it during SMB2_CREATE access validation, while\nparse_dacl() and smb_inherit_dacl() stop at pdacl_size.\n\nBound both ACE walks by pdacl_size to match the DACL boundary\nsemantics used elsewhere in the server.\n\nValidation:\n- semantic KUnit harness shows the post-boundary ACE is selected\n  before the fix and rejected (EACCES) after it\n- linux master (7.2-rc6), x86_64"}],"providerMetadata":{"dateUpdated":"2026-09-17T16:06:46.296Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a2051ffe452afad52f580b85a3fd8851933b1e7c"},{"url":"https://git.kernel.org/stable/c/a29f57a14c939586d84d7fd6a029bd1fd170098f"},{"url":"https://git.kernel.org/stable/c/a4a307d149327dad5fb25187e1b03cebd1b04de6"},{"url":"https://git.kernel.org/stable/c/8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67"},{"url":"https://git.kernel.org/stable/c/79decd88dd3f0d42e7fb0689b1a7853bfa302459"}],"title":"ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90153","datePublished":"2026-09-17T16:06:46.296Z","dateReserved":"2026-09-11T19:38:34.789Z","dateUpdated":"2026-09-17T16:06:46.296Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:08","lastModifiedDate":"2026-09-17 17:17:08","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90153","Ordinal":"1","Title":"ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size","CVE":"CVE-2026-90153","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90153","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: bound smb_check_perm_dacl() ACE walks by DACL size\n\nsmb_check_perm_dacl() validates that the DACL fits inside the NT\nsecurity descriptor, but then bounds its two ACE walks by the\nremaining NTSD length (acl_size) rather than the DACL's declared\nsize (pdacl_size).\n\nWhen pdacl->size is smaller than the trailing NTSD buffer, bytes\nafter the declared DACL boundary - still inside the stored security\ndescriptor - are parsed as ACEs during access checks.  A crafted\nDACL can place an access-granting ACE beyond pdacl->size, and the\ncurrent code accepts it during SMB2_CREATE access validation, while\nparse_dacl() and smb_inherit_dacl() stop at pdacl_size.\n\nBound both ACE walks by pdacl_size to match the DACL boundary\nsemantics used elsewhere in the server.\n\nValidation:\n- semantic KUnit harness shows the post-boundary ACE is selected\n  before the fix and rejected (EACCES) after it\n- linux master (7.2-rc6), x86_64","Type":"Description","Title":"ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size"}]}}}