Vulnerability-Lookup

RHSA-2026:57600

Vulnerability from csaf_redhat - Published: 2026-08-20 18:27 - Updated: 2026-08-20 20:51

Summary

Red Hat Security Advisory: mrtg security update

Severity

Important

Notes

Topic: An update for mrtg is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic. Security Fix(es): * mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: 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 Red Hat Inc. and provide a link to the original.

CVE-2026-72694

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.

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-0:2.17.7-12.el9_8.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-0:2.17.7-12.el9_8.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-0:2.17.7-12.el9_8.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-0:2.17.7-12.el9_8.1.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-0:2.17.7-12.el9_8.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debuginfo-0:2.17.7-12.el9_8.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debuginfo-0:2.17.7-12.el9_8.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debuginfo-0:2.17.7-12.el9_8.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debuginfo-0:2.17.7-12.el9_8.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debugsource-0:2.17.7-12.el9_8.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debugsource-0:2.17.7-12.el9_8.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debugsource-0:2.17.7-12.el9_8.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:mrtg-debugsource-0:2.17.7-12.el9_8.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:57600	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2460973	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-72694	self
https://bugzilla.redhat.com/show_bug.cgi?id=2460973	external
https://www.cve.org/CVERecord?id=CVE-2026-72694	external
https://nvd.nist.gov/vuln/detail/CVE-2026-72694	external

Acknowledgments

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        "relates_to_product_reference": "AppStream-9.8.0.Z.MAIN.EUS"
      },
      {
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        "product_reference": "mrtg-debugsource-0:2.17.7-12.el9_8.1.x86_64",
        "relates_to_product_reference": "AppStream-9.8.0.Z.MAIN.EUS"
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    ]
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "summary": "This issue was discovered by Red Hat."
        }
      ],
      "cve": "CVE-2026-72694",
      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
      "discovery_date": "2026-04-23T00:57:22+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
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        }
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "AppStream-9.8.0.Z.MAIN.EUS:mrtg-debugsource-0:2.17.7-12.el9_8.1.x86_64"
        ]
      },
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        {
          "category": "external",
          "summary": "RHBZ#2460973",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460973"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-72694",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-72694"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-72694",
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        }
      ],
      "release_date": "2026-08-11T07:28:48.463000+00:00",
      "remediations": [
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        },
        {
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            "baseSeverity": "HIGH",
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            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation"
    }
  ]
}

CVE-2026-72694 (GCVE-0-2026-72694)

Vulnerability from cvelistv5 – Published: 2026-08-11 08:37 – Updated: 2026-08-20 20:31

Title

Mrtg: mrtg daemon symlink-following chown allows local privilege escalation via pid file path manipulation

Summary

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 15:35 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:57596	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57600	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-72694	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460973	issue-trackingx_refsource_REDHAT

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.17.10-12.el10_2.1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.17.7-12.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8

Date Public

2026-08-11 07:28

Credits

This issue was discovered by Found by AISLE in partnership with Red Hat.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

RHSA-2026:57600

CVE-2026-72694 (GCVE-0-2026-72694)

Tags

Sightings

Nomenclature