{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: daemon-no-chroot TOCTOU symlink race\n     - debian/patches/CVE-2026-29518.patch: track per-module chroot in\n       am_chrooted and use_secure_symlinks; route the sender's read-path\n       open, the receiver's basis-file open, mkstemp, and inplace write\n       through secure_relative_open() / secure_mkstemp()\n     - CVE-2026-29518",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779694727",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779694727"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu18.04els/advisories/2026/clsa-2026_1779694727.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-05-25T07:39:13Z",
      "generator": {
        "date": "2026-05-25T07:39:13Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1779694727",
      "initial_release_date": "2026-05-25T07:39:13Z",
      "revision_history": [
        {
          "date": "2026-05-25T07:39:13Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-29518"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Ubuntu 18.04",
                "product": {
                  "name": "Ubuntu 18.04",
                  "product_id": "Ubuntu-18",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Ubuntu"
          }
        ],
        "category": "vendor",
        "name": "Canonical Ltd."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els7.amd64",
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                  }
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                "category": "product_version",
                "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els6.amd64",
                "product": {
                  "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els6.amd64",
                  "product_id": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els6.amd64",
                  "product_identification_helper": {
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                "product": {
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                "category": "product_version",
                "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els3.amd64",
                "product": {
                  "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els3.amd64",
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                "category": "product_version",
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                "product": {
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            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "CloudLinux"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els7.amd64 as a component of Ubuntu 18.04",
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        "relates_to_product_reference": "Ubuntu-18"
      },
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        },
        "product_reference": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els6.amd64",
        "relates_to_product_reference": "Ubuntu-18"
      },
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        },
        "product_reference": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els5.amd64",
        "relates_to_product_reference": "Ubuntu-18"
      },
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        "full_product_name": {
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        },
        "product_reference": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els3.amd64",
        "relates_to_product_reference": "Ubuntu-18"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els1.amd64 as a component of Ubuntu 18.04",
          "product_id": "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els1.amd64"
        },
        "product_reference": "rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-18"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-29518",
      "cwe": {
        "id": "CWE-367",
        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "notes": [
        {
          "category": "description",
          "text": "Rsync versions before 3.4.3 contain a time-of-check to time-of-use (TOCTOU) race condition in daemon file handling that allows attackers to redirect file writes outside intended directories by replacing parent directory components with symbolic links. Attackers with write access to a module path can exploit this race condition to create or overwrite arbitrary files, potentially modifying sensitive system files and achieving privilege escalation when the daemon runs with elevated privileges. This vulnerability can only be triggered if the chroot setting is false.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els7.amd64"
        ],
        "known_affected": [
          "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els1.amd64",
          "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els3.amd64",
          "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els5.amd64",
          "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els6.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-29518"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/pull/895/changes/8471fdd1561049ef5f58df44a1811a50bd9a531d",
          "url": "https://github.com/RsyncProject/rsync/pull/895/changes/8471fdd1561049ef5f58df44a1811a50bd9a531d"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3",
          "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/rsync-toctou-race-condition-allows-symlink-based-arbitrary-file-write",
          "url": "https://www.vulncheck.com/advisories/rsync-toctou-race-condition-allows-symlink-based-arbitrary-file-write"
        }
      ],
      "release_date": "2026-05-20T13:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-25T07:38:49.381546Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1779694727",
          "product_ids": [
            "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els7.amd64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779694727"
        },
        {
          "category": "none_available",
          "date": "2026-05-20T13:16:00Z",
          "details": "Affected",
          "product_ids": [
            "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els1.amd64",
            "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els3.amd64",
            "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els5.amd64",
            "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els6.amd64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Ubuntu-18:rsync-0:3.1.2-2.1ubuntu1.6+tuxcare.els7.amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}