ubuntu-cve-2026-1933
Vulnerability from osv_ubuntu
Published
2026-05-26 00:00
Modified
2026-06-04 10:57
Summary
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.

Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "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_name": "libldb2",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "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_name": "libtalloc2",
            "binary_version": "2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.16.2+samba4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "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_name": "python3-tdb",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "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_name": "samba-testsuite",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
          },
          {
            "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.22.3+dfsg-4ubuntu2.4?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.22.3+dfsg-4ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "binary_name": "libldb2",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "libtalloc2",
            "binary_version": "2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "libwbclient0",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "python3-talloc",
            "binary_version": "2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "samba",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "samba-common-bin",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "samba-testsuite",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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_name": "smbclient",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
          },
          {
            "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.23.6+dfsg-1ubuntu2.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.23.6+dfsg-1ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in Samba\u2019s 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.",
  "id": "UBUNTU-CVE-2026-1933",
  "modified": "2026-06-04T10:57:48Z",
  "published": "2026-05-26T00:00:00Z",
  "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"
    }
  ],
  "related": [
    "USN-8306-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "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": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-1933"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.