# CVE-2026-75092

## Summary

- **CVE ID:** CVE-2026-75092
- **Severity:** HIGH
- **CVSS Score:** 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-250
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

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.

## Affected Products

- 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)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-75092)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2517499)
- [CNA](https://github.com/oamg/leapp-repository)
- [CNA](https://github.com/oamg/leapp-repository/commit/3e4cafffc8de1600a66519b326a407f37b665356)
- [CNA](https://github.com/oamg/leapp-repository/pull/1343)
- [CNA](https://access.redhat.com/errata/RHSA-2026:67608)
- [CNA](https://access.redhat.com/errata/RHSA-2026:67609)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._