EUVD-2026-78326
GHSA-p54p-wj4h-hhp9
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V8 - Authorization Unnecessary privilege execution
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Alert meAnalysisAIv1 – Sep 15, 2026
Local privilege escalation in the scan_mysql actor of leapp-repository's leapp-upgrade-el9toel10 package allows code already running as the mysql OS account to obtain root on RHEL hosts during a RHEL 9 to RHEL 10 in-place upgrade. The actor invokes 'mysqld --validate-config' directly as root instead of via the packaged User=mysql systemd unit, so attacker-written persisted state (mysqld-auto.cnf pointing plugin_dir at the mysql-writable /var/lib/mysql) causes a malicious shared object to be dlopen()'d with UID 0 and full capabilities in the unconfined_t SELinux domain. Exploitation is not confirmed in the wild and no public exploit code was identified at time of analysis, but the upstream fix is public (leapp-repository PR 1343 / commit 3e4caff) and the CVSS score is 7.3 with all three impact metrics High.
Affected VersionsENISA
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Severity by source
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
DescriptionCVE.org
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
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SSVC AssessmentENISA
Priority Score
Attack Technique
Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.
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