UBUNTU-CVE-2026-41054 (CVE-2026-41054)

Vulnerability from osv_ubuntu – Published: 2026-05-20 10:16 – Updated: 2026-06-01 18:48 – Source website
VLAI
Details

In src/havegecmd.c, the socket_handler function performs a credential check on the abstract UNIX socket (\0/sys/entropy/haveged). However, while it detects if the connecting user is not root (cred.uid != 0) and prepares a negative acknowledgement (ASCII_NAK), it fails to stop execution. The code proceeds to the switch statement, allowing any local unprivileged user to execute privileged commands such as MAGIC_CHROOT.

Severity
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)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "haveged",
            "binary_version": "1.9.14-1ubuntu1+esm1~22.04.1"
          },
          {
            "binary_name": "libhavege2",
            "binary_version": "1.9.14-1ubuntu1+esm1~22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "haveged",
        "purl": "pkg:deb/ubuntu/haveged@1.9.14-1ubuntu1+esm1~22.04.1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.14-1ubuntu1+esm1~22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.14-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "haveged",
            "binary_version": "1.9.14-1ubuntu2+esm1~24.04.1"
          },
          {
            "binary_name": "libhavege2",
            "binary_version": "1.9.14-1ubuntu2+esm1~24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "haveged",
        "purl": "pkg:deb/ubuntu/haveged@1.9.14-1ubuntu2+esm1~24.04.1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.14-1ubuntu2+esm1~24.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.14-1ubuntu1",
        "1.9.14-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "haveged",
            "binary_version": "1.9.19-12+deb13u1build0.25.10.1"
          },
          {
            "binary_name": "libhavege2",
            "binary_version": "1.9.19-12+deb13u1build0.25.10.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "haveged",
        "purl": "pkg:deb/ubuntu/haveged@1.9.19-12+deb13u1build0.25.10.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.19-12+deb13u1build0.25.10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.19-11ubuntu1",
        "1.9.19-12"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "haveged",
            "binary_version": "1.9.19-14ubuntu0.1"
          },
          {
            "binary_name": "libhavege2",
            "binary_version": "1.9.19-14ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "haveged",
        "purl": "pkg:deb/ubuntu/haveged@1.9.19-14ubuntu0.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.19-14ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.19-12",
        "1.9.19-13",
        "1.9.19-14"
      ]
    }
  ],
  "aliases": [],
  "details": "In `src/havegecmd.c`, the `socket_handler` function performs a credential check on the abstract UNIX socket (`\\0/sys/entropy/haveged`). However, while it detects if the connecting user is not root (`cred.uid != 0`) and prepares a negative acknowledgement (`ASCII_NAK`), it **fails to stop execution**. The code proceeds to the `switch` statement, allowing any local unprivileged user to execute privileged commands such as `MAGIC_CHROOT`.",
  "id": "UBUNTU-CVE-2026-41054",
  "modified": "2026-06-01T18:48:11Z",
  "published": "2026-05-20T10:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-41054"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-41054"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1264086"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-41054"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/19/3"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/19/4"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/19/5"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/20/1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8358-1"
    }
  ],
  "related": [
    "USN-8358-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-41054"
  ]
}



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