CVE-2026-46164

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix double free in create_space_info_sub_group() error path When kobject_init_and_add() fails, the call chain is: create_space_info_sub_group() -> btrfs_sysfs_add_space_info_type() -> kobject_init_and_add() -> failure -> kobject_put(&sub_group->kobj) -> space_info_release() -> kfree(sub_group) Then control returns to create_space_info_sub_group(), where: btrfs_sysfs_add_space_info_type() returns error -> kfree(sub_group) Thus, sub_group is freed twice. Keep parent->sub_group[index] = NULL for the failure path, but after btrfs_sysfs_add_space_info_type() has called kobject_put(), let the kobject release callback handle the cleanup. A flaw was found in the Linux kernel’s btrfs filesystem. This vulnerability, a double free, occurs in the create_space_info_sub_group() function’s error handling path. When kobject_init_and_add() fails, a memory region can be freed twice. This can lead to memory corruption, potentially resulting in a denial of service or other unpredictable system behavior.

Live-patch status from KernelCare for each operating system.