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Fencer Intel
high 7.1

CVE-2026-72694 json

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

published 3mo ago modified 7d ago also EUVD-2026-55977

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:2.17.10-12.el10_2.1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.17.10-11.el10_0.1
  • Red Hat Red Hat Enterprise Linux 8 0:2.17.7-1.el8_10.1
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.17.7-1.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.17.7-1.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.17.7-1.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.17.7-1.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.17.7-1.el8_8.1
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.17.7-1.el8_8.1
  • Red Hat Red Hat Enterprise Linux 9 0:2.17.7-12.el9_8.1
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.17.7-10.el9_2.1
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.17.7-11.el9_4.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.17.7-11.el9_6.1
  • mrtg Debian 13 2.17.10-13+deb13u2
  • mrtg Debian 14 2.17.10-15

debian advisories DEBIAN-CVE-2026-72694

  • mrtg RHEL 8 2.17.7-1.el8_10.1
  • mrtg RHEL 9 2.17.7-12.el9_8.1
  • mrtg RHEL 10.2 2.17.10-12.el10_2.1
  • mrtg-selinux RHEL 10.2 2.17.10-12.el10_2.1

red hat advisories RHSA-2026:65832RHSA-2026:57600RHSA-2026:57596

  • mrtg AlmaLinux 8 2.17.7-1.el8_10.1
  • mrtg AlmaLinux 10 2.17.10-12.el10_2.1
  • mrtg-selinux AlmaLinux 10 2.17.10-12.el10_2.1
  • mrtg AlmaLinux 9 2.17.7-12.el9_8.1

almalinux advisories ALSA-2026:65832ALSA-2026:57596ALSA-2026:57600

  • mrtg Rocky Linux 8 2.17.7-1.el8_10.1
  • mrtg Rocky Linux 10 2.17.10-12.el10_2.1
  • mrtg Rocky Linux 9 2.17.7-12.el9_8.1

rocky linux advisories RLSA-2026:65832RLSA-2026:57596RLSA-2026:57600

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-72694 updated cvss 7.1

mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation

  • Red Hat Enterprise Linux 6 mrtg, mrtg-libs
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 mrtg
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) mrtg 2.17.7-1.el8_10.1
    fixed: vendor fix RHSA-2026:65832
  • Red Hat Enterprise Linux AppStream (v. 9) mrtg 2.17.7-12.el9_8.1
    fixed: vendor fix RHSA-2026:57600
  • Red Hat Enterprise Linux AppStream (v. 10) mrtg 2.17.10-12.el10_2.1, mrtg-selinux 2.17.10-12.el10_2.1
    fixed: vendor fix RHSA-2026:57596
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) mrtg 2.17.7-1.el8_4.1
    fixed: vendor fix RHSA-2026:91845
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) mrtg 2.17.7-1.el8_6.1
    fixed: vendor fix RHSA-2026:91844
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) mrtg 2.17.7-1.el8_8.1
    fixed: vendor fix RHSA-2026:91843
show 7 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) mrtg 2.17.7-10.el9_2.1
    fixed: vendor fix RHSA-2026:92071
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) mrtg 2.17.7-11.el9_4.1
    fixed: vendor fix RHSA-2026:92051
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) mrtg 2.17.10-11.el10_0.1, mrtg-selinux 2.17.10-11.el10_0.1
    fixed: vendor fix RHSA-2026:87255
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) mrtg 2.17.7-11.el9_6.1
    fixed: vendor fix RHSA-2026:91644
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) mrtg 2.17.7-1.el8_4.1
    fixed: vendor fix RHSA-2026:91845
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) mrtg 2.17.7-1.el8_6.1
    fixed: vendor fix RHSA-2026:91844
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) mrtg 2.17.7-1.el8_8.1
    fixed: vendor fix RHSA-2026:91843

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.