CVE-2026-72694

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When the MRTG daemon is started as a root user and subsequently drops privileges, a local, low-privileged attacker can exploit a symbolic link (symlink) following vulnerability. By influencing or pre-placing a symlink in the process ID (PID) file path, the attacker can trick the root process into changing the ownership of an arbitrary existing file to the daemon user. 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"To mitigate this issue, avoid starting the MRTG daemon as root with the `--daemon` option. Instead, configure MRTG to run directly as an unprivileged user. If root startup is strictly necessary, ensure that the PID file and its directory are owned by root and are not writable by unprivileged users, and prevent untrusted users from influencing the `--pid-file` path. 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Instead, configure MRTG to run directly as an unprivileged user. If root startup is strictly necessary, ensure that the PID file and its directory are owned by root and are not writable by unprivileged users, and prevent untrusted users from influencing the `--pid-file` path. Changes to service configuration may require a service restart to take effect."}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in MRTG. When the MRTG daemon is started as a root user and subsequently drops privileges, a local, low-privileged attacker can exploit a symbolic link (symlink) following vulnerability. By influencing or pre-placing a symlink in the process ID (PID) file path, the attacker can trick the root process into changing the ownership of an arbitrary existing file to the daemon user. 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{"acknowledgement": "This issue was discovered by Found by AISLE in partnership with Red Hat.", "bugzilla": {"description": "mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation", "id": "2460973", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460973"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-59", "details": ["A flaw was found in MRTG. When the MRTG daemon is started as a root user and subsequently drops privileges, a local, low-privileged attacker can exploit a symbolic link (symlink) following vulnerability. By influencing or pre-placing a symlink in the process ID (PID) file path, the attacker can trick the root process into changing the ownership of an arbitrary existing file to the daemon user. This can lead to local privilege escalation, allowing unauthorized access to or modification of sensitive files."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid starting the MRTG daemon as root with the `--daemon` option. Instead, configure MRTG to run directly as an unprivileged user. If root startup is strictly necessary, ensure that the PID file and its directory are owned by root and are not writable by unprivileged users, and prevent untrusted users from influencing the `--pid-file` path. Changes to service configuration may require a service restart to take effect."}, "name": "CVE-2026-72694", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "mrtg", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "mrtg", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "mrtg", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "mrtg", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "mrtg", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-11T07:28:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72694\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72694"], "threat_severity": "Important"}

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