CVE-2022-38791: 
MariaDB Server vulnerability analysis and mitigation

CVE-2022-38791 is a vulnerability discovered in MariaDB versions before 10.9.2, specifically affecting the compress_write function in extra/mariabackup/ds_compress.cc. The vulnerability was identified on August 27, 2022, and affects multiple versions of MariaDB including 10.3, 10.4, 10.5, 10.6, 10.7, and 10.8 (MITRE CVE, MariaDB JIRA).

The vulnerability occurs when the compress_write function fails to release data_mutex upon a stream write failure. This issue was identified as a bug in the fix for a previous vulnerability (MDEV-28689). The technical implementation shows that the lock thd->data_mutex is not properly released during erroneous writing to the destination stream (MariaDB JIRA).

When successfully exploited, this vulnerability can allow local users to trigger a deadlock in the system, potentially leading to a Denial of Service (DoS) condition (NetApp Security).

The vulnerability requires local access to exploit and has been assigned a CVSS score of 5.5 (MEDIUM) with the vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NetApp Security).

The vulnerability has been fixed in MariaDB versions 10.3.36, 10.4.26, 10.5.17, 10.6.9, 10.7.5, 10.8.4, and 10.9.2. Users are advised to upgrade to these or later versions to mitigate the vulnerability (Debian Security).