{"id":"CVE-2026-109411","aliases":[],"cve":{"records":[{"id":"CVE-2026-109411","source":"redhat","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-12T15:19:07.605Z","published":"2026-10-28T19:17:45.459Z","modified":"2026-11-04T21:48:36.103Z"}],"publishers":[{"name":"redhat","role":"CNA","organizationId":"53f830b8-0a3f-465b-8143-3b8a9948e749","modified":"2026-11-04T21:48:36.103Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T20:54:00.468Z"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-109411","tags":["vdb-entry","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://attachments.samba.org/attachment.cgi?id=19294","tags":[],"source":"redhat"},{"url":"https://attachments.samba.org/attachment.cgi?id=19295","tags":[],"source":"redhat"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552136","tags":["issue-tracking","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://bugzilla.samba.org/show_bug.cgi?id=16276","tags":[],"source":"redhat"}],"weaknesses":[{"id":"CWE-178","description":"Improper Handling of Case Sensitivity","source":"redhat"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T15:36:56.528765Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"Samba: access control bypass via vfs_ceph_rgw case-insensitive open","titleSource":"redhat","descriptionSource":"redhat","description":"An access control bypass flaw was identified in Samba's vfs_ceph_rgw module in it's openat() function. An authenticated user can bypass access controls to read or overwrite restricted files on shares configured with the experimental vfs_ceph_rgw module. When a client requests an existing file using mismatched character casing, the module fails to perform a case-insensitive lookup correctly, causing the server to treat the operation as creating a new file. As a result, the server skips standard permission checks on the existing file, allowing the attacker to access or overwrite sensitive data owned by other users.","score":8.1,"severity":"high","published":"2026-10-28T19:17:45.459Z","modified":"2026-11-04T21:48:36.103Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Samba","name":"Samba","platforms":[],"versions":[{"version":"4.25.0","status":"affected","lessThan":"4.25.1","versionType":"semver"}],"defaultStatus":"unaffected","cpes":[],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat Enterprise Linux 10","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/a:redhat:enterprise_linux:10"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat Enterprise Linux 6","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/o:redhat:rhel_els:6"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat Enterprise Linux 6","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/o:redhat:rhel_els:6"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat Enterprise Linux 7","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/o:redhat:rhel_els:7"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat Enterprise Linux 8","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/a:redhat:enterprise_linux:8"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat Enterprise Linux 9","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/a:redhat:enterprise_linux:9"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 4","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift:4"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 4","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift:4"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 5","platforms":[],"versions":[],"defaultStatus":"unaffected","cpes":["cpe:/a:redhat:openshift:5"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"}],"remediation":[{"text":"Only shares configured with the vfs_ceph_rgw module are affected.\n\nTo mitigate this vulnerability, disable the experimental `vfs_ceph_rgw` module on any configured Samba shares. Edit `/etc/samba/smb.conf` to remove `ceph_rgw` from the `vfs objects` setting under the relevant share sections, then reload the Samba service:\n\n```\nsystemctl reload smb\n```\n\nWarning: Reloading or restarting the `smb` service may briefly interrupt active client sessions. Additionally, removing this module disables Ceph RGW integration for the affected shares.\n\nSetting ```case sensitive = yes``` on affected shares avoids the vulnerability, because the differently-cased name is then treated as a distinct object rather than resolving to the existing file. \n\nNote: This changes share behavior for clients that rely on case-insensitive name handling.","source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"}],"references":["https://access.redhat.com/security/cve/CVE-2026-109411","https://attachments.samba.org/attachment.cgi?id=19294","https://attachments.samba.org/attachment.cgi?id=19295","https://bugzilla.redhat.com/show_bug.cgi?id=2552136","https://bugzilla.samba.org/show_bug.cgi?id=16276"],"sources":[{"name":"CVE","id":"CVE-2026-109411","modified":"2026-11-04T21:48:36.103Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"}],"assessments":[{"source":"redhat","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1}],"sourceAffected":[],"observedAt":"2026-11-04T23:16:03.458Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:30:31.194Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-30T02:00:33.152Z","attemptedAt":"2026-10-30T02:00:33.152Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-30T02:00:31.220Z","attemptedAt":"2026-10-30T02:00:31.220Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T02:00:30.949Z","attemptedAt":"2026-10-30T02:00:30.949Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-30T02:00:30.951Z","attemptedAt":"2026-10-30T02:00:30.951Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-112398","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112398","modified":"Oct 29, 2026, 8:54:00 PM","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","checkedAt":"2026-10-30T02:00:30.949Z"},{"source":"FIRST EPSS","id":"CVE-2026-109411","url":"https://www.first.org/epss/","probability":0.00649,"percentile":0.51031,"date":"2026-10-29","checkedAt":"2026-10-30T02:00:30.951Z"},{"source":"GitHub Advisory Database","id":"GHSA-pwp9-3h93-h2x8","url":"https://github.com/advisories/GHSA-pwp9-3h93-h2x8","modified":"2026-10-28T21:31:25Z","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","checkedAt":"2026-10-30T02:00:31.220Z"},{"source":"NVD","id":"CVE-2026-109411","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109411","modified":"2026-10-29T21:17:11.050","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","checkedAt":"2026-10-30T02:00:33.152Z"}],"aiSummary":{"text":"Samba's vfs_ceph_rgw module has an access control bypass flaw, allowing authenticated users to read or overwrite restricted files on shares configured with this module due to incorrect case-insensitive lookup. The vulnerability affects Samba version 4.25.0. An attacker can bypass access controls by requesting an existing file with mismatched character casing.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-04T23:36:06.960Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-109411"}]}}