CVE-2022-20572: 
Linux Kernel vulnerability analysis and mitigation

CVE-2022-20572 is a vulnerability discovered in the Linux kernel's dm-verity-target.c component, specifically in the verity_target function. The vulnerability was disclosed in December 2022 and affects Android kernel versions as well as various Linux distributions. The issue stems from a missing permission check that could allow modification of read-only files (CVE Mitre).

The vulnerability exists in the device-mapper verity (dm-verity) driver of the Linux kernel, where a missing permission check in the verity_target function of dm-verity-target.c could allow unauthorized modifications to read-only files. The issue has been assigned a CVSS 3 Severity Score of 6.7 (Medium) (Ubuntu Security).

This vulnerability could lead to local escalation of privilege with System execution privileges. The flaw enables potential modification of read-only files, which could compromise system integrity. No user interaction is required for exploitation (Red Hat Security).

Multiple Linux distributions have released patches to address this vulnerability. Ubuntu has fixed the issue in various kernel versions including 5.15.0-47.51 for 22.04 LTS, 5.4.0-126.142 for 20.04 LTS, and 4.15.0-191.202 for 18.04 LTS. The fix has also been backported to older supported versions (Ubuntu Security).