CVE-2024-53106: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-53106 affects the Linux kernel's Integrity Measurement Architecture (IMA) subsystem. The vulnerability was discovered in the imaeventdigestinitcommon function, where a buffer overrun condition exists when imaeventdigestinit() calls imaeventdigestinitcommon() with HASHALGO_LAST parameter. This parameter is then used to access the array hashdigestsize[] which can lead to a buffer overrun condition (Kernel Git).

The vulnerability exists in the security/integrity/ima/imatemplatelib.c file. When the imaeventdigestinit() function calls imaeventdigestinitcommon() with HASHALGOLAST parameter, it attempts to access the hashdigestsize array without proper bounds checking. The fix involves adding a conditional statement to handle cases where hashalgo is equal to or greater than HASHALGOLAST, using IMADIGESTSIZE as a fallback which fits SHA1 or MD5 (Kernel Git).

A buffer overrun in the IMA subsystem could potentially lead to memory corruption, which may result in system crashes or potential privilege escalation. The vulnerability affects the integrity measurement functionality of the Linux kernel (NVD).

The issue has been fixed in multiple Linux kernel versions. The fix involves adding proper bounds checking before accessing the hashdigestsize array. Users should update their Linux kernel to a patched version. The fix has been backported to various stable kernel branches including 6.1.y (Debian LTS).