CVE-2026-43106 is a high severity vulnerability in the Linux kernel's cachefiles subsystem involving incorrect reference counting of dentries in the cachefiles_cull() function. The flaw arises because cachefiles_cull() calls cachefiles_bury_object() with a dentry holding only one reference instead of the expected two, resulting in a lost reference. This can lead to memory corruption or instability in the kernel cachefiles feature.