Apple macOS AMDRadeonX4000_AMDSIGLContext discard_StretchTex2Tex Double Free Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Apple macOS. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the discard_StretchTex2Tex method of the AMDRadeonX4000_AMDSIGLContext class. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges to the level of the kernel.