CVE-2023-52469: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-52469 is a use-after-free vulnerability discovered in the Linux kernel's AMD power management driver, specifically in the kv_parse_power_table function within drivers/amd/pm. The vulnerability was disclosed on February 26, 2024, affecting Linux kernel versions from 4.2.0 up to versions before 4.19.306, 5.4.268, 5.10.209, 5.15.148 (NVD).

The vulnerability occurs when ps allocated by kzalloc equals NULL, causing kv_parse_power_table to free adev->pm.dpm.ps that was allocated before. The issue manifests through the following call chain: kv_parse_power_table -> kv_dpm_init -> kv_dpm_sw_init -> kv_dpm_fini, where adev->pm.dpm.ps is used in the for loop of kv_dpm_fini after its first free in kv_parse_power_table, resulting in a use-after-free condition. The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (High) with vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (NVD).

The vulnerability could potentially lead to privilege escalation, denial of service, or information disclosure on affected systems. However, the impact is mitigated by the fact that local access is required and the vulnerability only occurs on allocation failure, which is very unlikely for an attacker to influence (Ubuntu).

The vulnerability has been fixed in the Linux kernel through a patch that properly handles memory allocation failure cases. The fix has been backported to various kernel versions and is available through distribution updates. Major Linux distributions have released security updates addressing this vulnerability, including Ubuntu, Debian, and Red Hat (Kernel Patch).