btrfs: fix double free in create_space_info() error path

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Summary

CVECVE-2026-46129
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:28 UTC
Updated2026-05-30 11:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: btrfs: fix double free in create_space_info() error path When kobject_init_and_add() fails, the call chain is: create_space_info() -> btrfs_sysfs_add_space_info_type() -> kobject_init_and_add() -> failure -> kobject_put(&space_info->kobj) -> space_info_release() -> kfree(space_info) Then control returns to create_space_info(): btrfs_sysfs_add_space_info_type() returns error -> goto out_free -> kfree(space_info) This causes a double free. Keep the direct kfree(space_info) for the earlier 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 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 58208907c4044a764dbd8896026283905da6d9be c2670ec4aa49ca226bce9776601e0da37502be07 git Not specified
CNA Linux Linux affected bb4fa4c0b54aae25e55faeda7f78d0c11b8cd618 f414b3abbba59ef379a2b3c31f2bdd9358ed5e53 git Not specified
CNA Linux Linux affected 6cb008f1bb23e023dfe615cca5df14570dfc8da5 9a060970fd7b5e1c561e4ce73cb9949e4269a738 git Not specified
CNA Linux Linux affected a11224a016d6d1d46a4d9b6573244448a80d4d7f dd6ade0fdd59218d71a981ae7c937a304e49209c git Not specified
CNA Linux Linux affected a11224a016d6d1d46a4d9b6573244448a80d4d7f 3f487be81292702a59ea9dbc4088b3360a50e837 git Not specified
CNA Linux Linux affected 20e8f2de3688082eeafeb93c8900485b7542457e git Not specified
CNA Linux Linux affected 6.6.122 6.6.140 semver Not specified
CNA Linux Linux affected 6.12.67 6.12.88 semver Not specified
CNA Linux Linux affected 6.18.7 6.18.30 semver Not specified
CNA Linux Linux affected 6.1.162 6.2 semver Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.30 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/dd6ade0fdd59218d71a981ae7c937a304e49209c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f487be81292702a59ea9dbc4088b3360a50e837 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f414b3abbba59ef379a2b3c31f2bdd9358ed5e53 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2670ec4aa49ca226bce9776601e0da37502be07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a060970fd7b5e1c561e4ce73cb9949e4269a738 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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