CVE-2026-72694 (GCVE-0-2026-72694)
Vulnerability from cvelistv5
Published
2026-08-11 08:37
Modified
2026-10-28 22:05
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Summary
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.
References
https://access.redhat.com/errata/RHSA-2026:57596 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57600 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:65832 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:87255 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:91644 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:91844 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:92051 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-72694 vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460973 issue-tracking, x_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:2.17.10-12.el10_2.1   < *
    cpe:/o:redhat:enterprise_linux:10.2
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:2.17.10-11.el10_0.1   < *
    cpe:/o:redhat:enterprise_linux_eus:10.0
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.17.7-1.el8_10.1   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:2.17.7-1.el8_6.1   < *
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:2.17.7-1.el8_6.1   < *
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.17.7-12.el9_8.1   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:2.17.7-11.el9_4.1   < *
    cpe:/a:redhat:rhel_e4s:9.4::appstream
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:2.17.7-11.el9_6.1   < *
    cpe:/a:redhat:rhel_eus:9.6::appstream
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Show details on NVD website


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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. This can lead to local privilege escalation, allowing unauthorized access to or modification of sensitive files.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-59\", \"description\": \"Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-10-28T22:05:04.718Z\"}, \"x_redhatCweChain\": \"CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72694\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-28T22:05:04.718Z\", \"dateReserved\": \"2026-08-10T12:35:16.746Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-08-11T08:37:55.392Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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