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Fencer Vulns
high 7.3

CVE-2026-75092 json

Leapp-repository: leapp-upgrade-el9toel10: leapp-upgrade-el9toel10: scan_mysql runs mysqld --validate-config as root and can load mysql-writable plugins

published 2026-09-15 55 d ago modified 2026-11-05 4 d ago also EUVD-2026-78326

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

A privilege escalation flaw was found in the scan_mysql actor of leapp-upgrade-el9toel10 (provided by leapp-repository). During RHEL 9 to RHEL 10 upgrades, the actor runs: mysqld --validate-config --log-error-verbosity=2 directly as root in the Leapp actor context, bypassing the packaged MySQL systemd unit that normally starts the daemon as User=mysql.

A process compromised as the mysql OS identity can write a version-2 persisted configuration (mysqld-auto.cnf) and a malicious shared object into /var/lib/mysql (a directory owned by mysql). That persisted map can set plugin_dir to /var/lib/mysql and early_plugin_load (or related loader options such as plugin_load / plugin_load_add) so MySQL loads the attacker-controlled object during configuration validation. Plugin loading can reach dlopen() before MySQL’s runtime-user check and before plugin-symbol validation.

When an administrator subsequently runs the documented Leapp preupgrade or upgrade workflow, attacker-controlled code can execute as UID 0 with a full capability set in an unconfined SELinux domain (unconfined_t). The attack does not require write access to the default system plugin path under /usr; redirecting plugin_dir via mysql-owned persisted state is sufficient. Ordinary SQL privileges alone (including highly privileged SQL accounts) are not a sufficient startpoint — OS-level execution as the mysql service identity is required, plus later administrator invocation of Leapp.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 9 0:0.24.0-1.el9_8.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:0.22.0-1.el9_6.2
  • leapp-repository RHEL 9 0.24.0-1.el9_8.1
  • leapp-upgrade-el9toel10 RHEL 9 0.24.0-1.el9_8.1
  • leapp-upgrade-el9toel10-deps RHEL 9 0.24.0-1.el9_8.1
  • leapp-upgrade-el9toel10-fapolicyd RHEL 9 0.24.0-1.el9_8.1
  • leapp-repository RHEL 9.6 EUS 0.22.0-1.el9_6.2
  • leapp-upgrade-el9toel10 RHEL 9.6 EUS 0.22.0-1.el9_6.2
  • leapp-upgrade-el9toel10-deps RHEL 9.6 EUS 0.22.0-1.el9_6.2

red hat advisories RHSA-2026:67609RHSA-2026:67608

  • leapp-repository Rocky Linux 9 0.24.0-1.el9_8.1

rocky linux advisories RLSA-2026:67608

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-2026-75092 updated cvss 7.3

leapp-repository: leapp-upgrade-el9toel10: leapp-upgrade-el9toel10: scan_mysql runs mysqld --validate-config as root and can load mysql-writable plugins

  • Red Hat Enterprise Linux AppStream (v. 9) leapp-repository 0.24.0-1.el9_8.1, leapp-upgrade-el9toel10 0.24.0-1.el9_8.1, leapp-upgrade-el9toel10-deps 0.24.0-1.el9_8.1, leapp-upgrade-el9toel10-fapolicyd 0.24.0-1.el9_8.1
    fixed: vendor fix RHSA-2026:67608
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) leapp-repository 0.22.0-1.el9_6.2, leapp-upgrade-el9toel10 0.22.0-1.el9_6.2, leapp-upgrade-el9toel10-deps 0.22.0-1.el9_6.2
    fixed: vendor fix RHSA-2026:67609
  • Red Hat Enterprise Linux 8 leapp-upgrade-el8toel9, leapp-upgrade-el8toel9-deps, leapp-upgrade-el8toel9-fapolicyd Red Hat OpenStack Platform 17.1 leapp-repository-openstack
    not affected: vulnerable code not present

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
55 d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat OpenStack Platform 17.1

Classification

Weakness
  • CWE-250 Execution with Unnecessary Privileges

References

Sources

Fencer Vulns 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.