CVE-2025-38049

Summary

CVE-2025-38049 is a vulnerability affecting the Linux kernel that stems from an issue in the 'x86/resctrl' module. The flaw arises due to a failure to properly allocate memory for the cleanest Control Line State Identifier (CLOSID) on platforms without monitoring identifiers. This issue results in a NULL pointer dereference when creating a new control group, as the array was not allocated on these platforms. To mitigate this vulnerability, the code has been updated to check for the presence of cache occupancy monitors before attempting to allocate the CLOSID, thereby preventing the occurrence of this issue on affected systems.

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