CVE-2026-46164

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.

• linux linux kernel (>= 6.1.162 < 6.2) • linux linux kernel (>= 6.6.122 < 6.6.141) • linux linux kernel (>= 6.12.67 < 6.12.90) • linux linux kernel (>= 6.16 < 6.18.32) • linux linux kernel (>= 6.19 < 7.0.7)