CVE-2026-46164
Description
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.
How to fix
- linux linux_kernel6.2, 6.6.141, 6.12.90, 6.18.32, 7.0.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.1.162 ≤ v < 6.2, 6.6.122 ≤ v < 6.6.141, 6.12.67 ≤ v < 6.12.90, 6.16 ≤ v < 6.18.32, 6.19 ≤ v < 7.0.7 | 6.2, 6.6.141, 6.12.90, 6.18.32, 7.0.7 |
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