RHSA-2026:87255
Vulnerability from csaf_redhat - Published: 2026-10-21 18:36 - Updated: 2026-10-29 06:22A 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.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-0:2.17.10-11.el10_0.1.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-0:2.17.10-11.el10_0.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-0:2.17.10-11.el10_0.1.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-0:2.17.10-11.el10_0.1.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-0:2.17.10-11.el10_0.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debuginfo-0:2.17.10-11.el10_0.1.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debuginfo-0:2.17.10-11.el10_0.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debuginfo-0:2.17.10-11.el10_0.1.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debuginfo-0:2.17.10-11.el10_0.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debugsource-0:2.17.10-11.el10_0.1.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debugsource-0:2.17.10-11.el10_0.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debugsource-0:2.17.10-11.el10_0.1.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-debugsource-0:2.17.10-11.el10_0.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:mrtg-selinux-0:2.17.10-11.el10_0.1.noarch | — |
Vendor Fix
fix
Workaround
|
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"text": "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.",
"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": {
"fixed": [
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-72694"
},
{
"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",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72694"
}
],
"release_date": "2026-08-11T07:28:48.463000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-21T18:36:28+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:87255"
},
{
"category": "workaround",
"details": "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.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"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"
}
]
}
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.