{"id":"UBUNTU-CVE-2026-1933","details":"A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only exports. This could allow modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types.","modified":"2026-06-04T12:45:25.457026084Z","published":"2026-05-26T00:00:00Z","related":["USN-8306-1"],"upstream":["CVE-2026-1933"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-1933"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-1933"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8306-1"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/samba?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.22.3+dfsg-4ubuntu2.4"}]}],"versions":["2:4.21.4+dfsg-1ubuntu3","2:4.21.4+dfsg-1ubuntu4","2:4.21.4+dfsg-1ubuntu5","2:4.22.2+dfsg-1ubuntu1","2:4.22.3+dfsg-4ubuntu1","2:4.22.3+dfsg-4ubuntu2","2:4.22.3+dfsg-4ubuntu2.1","2:4.22.3+dfsg-4ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_name":"ctdb","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"ldb-tools","binary_version":"2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"},{"binary_version":"2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4","binary_name":"libldb2"},{"binary_name":"libnss-winbind","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"libpam-winbind","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"libsmbclient0","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_version":"2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4","binary_name":"libtalloc2"},{"binary_version":"2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4","binary_name":"libtdb1"},{"binary_name":"libtevent0t64","binary_version":"2:0.16.2+samba4.22.3+dfsg-4ubuntu2.4"},{"binary_version":"2:4.22.3+dfsg-4ubuntu2.4","binary_name":"libwbclient0"},{"binary_name":"python3-ldb","binary_version":"2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"python3-samba","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"python3-talloc","binary_version":"2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4"},{"binary_version":"2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4","binary_name":"python3-tdb"},{"binary_name":"registry-tools","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_version":"2:4.22.3+dfsg-4ubuntu2.4","binary_name":"samba"},{"binary_name":"samba-ad-dc","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-ad-provision","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-common","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-common-bin","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-libs","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_version":"2:4.22.3+dfsg-4ubuntu2.4","binary_name":"samba-testsuite"},{"binary_name":"samba-vfs-ceph","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-vfs-glusterfs","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"samba-vfs-modules-extra","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"smbclient","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"tdb-tools","binary_version":"2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"},{"binary_name":"winbind","binary_version":"2:4.22.3+dfsg-4ubuntu2.4"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1933.json"}},{"package":{"name":"samba","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/samba?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.23.6+dfsg-1ubuntu2.1"}]}],"versions":["2:4.22.3+dfsg-4ubuntu2","2:4.22.3+dfsg-4ubuntu2.1","2:4.22.3+dfsg-4ubuntu3","2:4.22.3+dfsg-4ubuntu4","2:4.23.4+dfsg-1ubuntu1","2:4.23.5+dfsg-1ubuntu2","2:4.23.6+dfsg-1ubuntu1","2:4.23.6+dfsg-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"ctdb","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1","binary_name":"ldb-tools"},{"binary_name":"libldb2","binary_version":"2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"libnss-winbind"},{"binary_name":"libpam-winbind","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"libsmbclient0","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1","binary_name":"libtalloc2"},{"binary_name":"libtdb1","binary_version":"2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"libtevent0t64","binary_version":"2:0.17.1+samba4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"libwbclient0"},{"binary_name":"python3-ldb","binary_version":"2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"python3-samba","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1","binary_name":"python3-talloc"},{"binary_name":"python3-tdb","binary_version":"2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"registry-tools","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"samba"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"samba-ad-dc"},{"binary_name":"samba-ad-provision","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"samba-common","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"samba-common-bin"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"samba-libs","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"samba-testsuite"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"samba-vfs-ceph"},{"binary_name":"samba-vfs-glusterfs","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"samba-vfs-modules-extra","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"},{"binary_version":"2:4.23.6+dfsg-1ubuntu2.1","binary_name":"smbclient"},{"binary_name":"tdb-tools","binary_version":"2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"},{"binary_name":"winbind","binary_version":"2:4.23.6+dfsg-1ubuntu2.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1933.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}