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btrfs: fix double free in create_space_info_sub_group() error path

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.176, 6.12.90, 6.18.32, 6.6.141, 7.0.7
CVEs
CVE-2026-46164
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 17:51 UTC · Revision 1

Source evidence

btrfs: fix double free in create_space_info_sub_group() error path

core-osv · Original source

Published 28 May 2026, 09:36 UTC

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.

osv:CVE-2026-46164

Kernel

Fixed versions: 6.1.176, 6.6.141, 6.12.90, 6.18.32, 7.0.7

Complete source record
{
  "id": "2b430e8795ef99652ba49db39852770af11c8d790ae86fa2e547bf475fc7d3ed",
  "url": "https://osv.dev/vulnerability/CVE-2026-46164",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "btrfs: fix double free in create_space_info_sub_group() error path",
    "summary": "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.",
    "evidence": "osv:CVE-2026-46164",
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      "modified": "2026-10-28T02:30:38.163152400Z",
      "provider": "osv",
      "references": [
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  "source_id": "core-osv",
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}