CVE-2026-46164

published 2026-05-28

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…

high 7 CVSS 3.1

AV L AC H PR N UI R S U C H I H A H

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.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
linux	linux	—	—
linux	linux	—	—
linux	linux	>= 0bd151ce4200ca847990e05cca29a76456982ca5 < d2a675f2e238ec96c8e91e2718c1f910c9c8fb21	d2a675f2e238ec96c8e91e2718c1f910c9c8fb21
linux	linux	>= 190d5a7c4fe42b8c9aa46e3336389e7cb10395bb < 14b22be1dd844383eb03af9b1ee3b6b25d32aeaf	14b22be1dd844383eb03af9b1ee3b6b25d32aeaf
linux	linux	>= 6.1.162 < 6.2	6.2
linux	linux	>= 6.12.67 < 6.12.90	6.12.90
linux	linux	>= 6.6.122 < 6.6.141	6.6.141
linux	linux	>= f92ee31e031c7819126d2febdda0c3e91f5d2eb9 < dfd05a16b5c9d1d98b47905f37f2fccda52173d1	dfd05a16b5c9d1d98b47905f37f2fccda52173d1
linux	linux	>= f92ee31e031c7819126d2febdda0c3e91f5d2eb9 < 259af6857a1b4f1e9ef8b780353f9d11c26a22bd	259af6857a1b4f1e9ef8b780353f9d11c26a22bd
linux	linux	>= f92ee31e031c7819126d2febdda0c3e91f5d2eb9 < a7449edf96143f192606ec8647e3167e1ecbd728	a7449edf96143f192606ec8647e3167e1ecbd728
linux	linux_kernel	—	—

CWE-1341