CVE-2025-21772: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-21772 addresses multiple security issues in the Linux kernel's handling of Mac partition tables. The vulnerability was discovered in February 2025 and affects the partitions/mac subsystem of the Linux kernel. The issue involves improper handling of bogus partition tables that could lead to potential security risks (Kernel Git).

The vulnerability stems from three distinct issues in partition probing: 1) A bailout condition for bad partoffset that incorrectly handles sector cleanup, 2) Improper handling of non-standard sector sizes (like 0xfff bytes) that could result in partition table entries straddling sector boundaries and potential out-of-bounds memory access, and 3) Unsafe assumptions about NUL termination in partition tables. The fix involves proper cleanup using putdevsector(), validation of sector sizes using ispowerof_2(), and safer string handling with strnlen() and strncmp() instead of strlen() and strcmp() (Kernel Git).

The vulnerability could potentially lead to out-of-bounds memory access when processing malformed partition tables. This could result in system crashes or potential security implications when handling specially crafted partition tables (Kernel Git).

The issue has been resolved through patches in the Linux kernel. The fix includes proper validation of sector sizes, correct cleanup of resources, and safer string handling functions. Users should update their Linux kernel to a version that includes these security fixes (Kernel Git).