ubuntu-cve-2026-35535
Vulnerability from osv_ubuntu
Published
2026-04-03 03:16
Modified
2026-06-30 16:20
Summary
Details

In Sudo through 1.9.17p2 before 3e474c2, a failure of a setuid, setgid, or setgroups call, during a privilege drop before running the mailer, is not a fatal error and can lead to privilege escalation.

Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
high
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.9.9-1ubuntu2.6"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.9.9-1ubuntu2.6"
          }
        ],
        "priority_reason": "Local privilege escalation to the root user."
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.9.9-1ubuntu2.6?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.9-1ubuntu2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.5p2-3ubuntu2",
        "1.9.9-1ubuntu2",
        "1.9.9-1ubuntu2.1",
        "1.9.9-1ubuntu2.2",
        "1.9.9-1ubuntu2.3",
        "1.9.9-1ubuntu2.4",
        "1.9.9-1ubuntu2.5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-sudo",
            "binary_version": "1.9.15p5-3ubuntu5.24.04.2"
          },
          {
            "binary_name": "sudo",
            "binary_version": "1.9.15p5-3ubuntu5.24.04.2"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.9.15p5-3ubuntu5.24.04.2"
          }
        ],
        "priority_reason": "Local privilege escalation to the root user."
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.9.15p5-3ubuntu5.24.04.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.15p5-3ubuntu5.24.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.14p2-1ubuntu1",
        "1.9.15p5-3ubuntu1",
        "1.9.15p5-3ubuntu3",
        "1.9.15p5-3ubuntu4",
        "1.9.15p5-3ubuntu5",
        "1.9.15p5-3ubuntu5.24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-sudo",
            "binary_version": "1.9.17p2-1ubuntu1.1"
          },
          {
            "binary_name": "sudo",
            "binary_version": "1.9.17p2-1ubuntu1.1"
          }
        ],
        "priority_reason": "Local privilege escalation to the root user."
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.9.17p2-1ubuntu1.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.17p2-1ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.16p2-1ubuntu1",
        "1.9.16p2-1ubuntu4",
        "1.9.16p2-3ubuntu2",
        "1.9.17p2-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "In Sudo through 1.9.17p2 before 3e474c2, a failure of a setuid, setgid, or setgroups call, during a privilege drop before running the mailer, is not a fatal error and can lead to privilege escalation.",
  "id": "UBUNTU-CVE-2026-35535",
  "modified": "2026-06-30T16:20:57Z",
  "published": "2026-04-03T03:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35535"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35535"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sudo-project/sudo/commit/3e474c2f201484be83d994ae10a4e20e8c81bb69"
    },
    {
      "type": "REPORT",
      "url": "https://www.qualys.com/2026/03/10/crack-armor.txt"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/vulnerabilities/crackarmor"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/blog/apparmor-vulnerability-fixes-available"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8092-1"
    }
  ],
  "related": [
    "USN-8092-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-35535"
  ]
}



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Sightings

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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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.