btrfs: fix double free in create_space_info_sub_group() error path

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Summary

CVECVE-2026-46164
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:32 UTC
Updated2026-05-30 11:17:24 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.000180000 probability, percentile 0.051640000 (date 2026-05-29)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0bd151ce4200ca847990e05cca29a76456982ca5 d2a675f2e238ec96c8e91e2718c1f910c9c8fb21 git Not specified
CNA Linux Linux affected 190d5a7c4fe42b8c9aa46e3336389e7cb10395bb 14b22be1dd844383eb03af9b1ee3b6b25d32aeaf git Not specified
CNA Linux Linux affected f92ee31e031c7819126d2febdda0c3e91f5d2eb9 dfd05a16b5c9d1d98b47905f37f2fccda52173d1 git Not specified
CNA Linux Linux affected f92ee31e031c7819126d2febdda0c3e91f5d2eb9 259af6857a1b4f1e9ef8b780353f9d11c26a22bd git Not specified
CNA Linux Linux affected f92ee31e031c7819126d2febdda0c3e91f5d2eb9 a7449edf96143f192606ec8647e3167e1ecbd728 git Not specified
CNA Linux Linux affected 64c7ddda83acfbaa0efb381a1928ce908c584607 git Not specified
CNA Linux Linux affected 6.6.122 6.6.141 semver Not specified
CNA Linux Linux affected 6.12.67 6.12.90 semver Not specified
CNA Linux Linux affected 6.1.162 6.2 semver Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.90 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.32 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/14b22be1dd844383eb03af9b1ee3b6b25d32aeaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a7449edf96143f192606ec8647e3167e1ecbd728 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/259af6857a1b4f1e9ef8b780353f9d11c26a22bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2a675f2e238ec96c8e91e2718c1f910c9c8fb21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dfd05a16b5c9d1d98b47905f37f2fccda52173d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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