apparmor: fix race on rawdata dereference

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Summary

CVECVE-2026-23410
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-01 09:16:17 UTC
Updated2026-04-18 09:16:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: apparmor: fix race on rawdata dereference There is a race condition that leads to a use-after-free situation: because the rawdata inodes are not refcounted, an attacker can start open()ing one of the rawdata files, and at the same time remove the last reference to this rawdata (by removing the corresponding profile, for example), which frees its struct aa_loaddata; as a result, when seq_rawdata_open() is reached, i_private is a dangling pointer and freed memory is accessed. The rawdata inodes weren't refcounted to avoid a circular refcount and were supposed to be held by the profile rawdata reference. However during profile removal there is a window where the vfs and profile destruction race, resulting in the use after free. Fix this by moving to a double refcount scheme. Where the profile refcount on rawdata is used to break the circular dependency. Allowing for freeing of the rawdata once all inode references to the rawdata are put.

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: 0.000130000 probability, percentile 0.023950000 (date 2026-04-21)

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 5d5182cae40115c03933989473288e54afb39c7c 3b8e77c7abab40e6de9ad9de730d77984a498840 git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c d9d8560b9b7932f8cffc4c068c14289220900f79 git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c 6b6ba87579c7e7c669e0bec91823e7fb693bc5df git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c 6ef1f2926c41ab96952d9696d55a052f1b3a9418 git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c f9761add6d100962a23996cb68f3d6abdd4d1815 git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c af782cc8871e3683ddd5a3cd2f7df526599863a9 git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c 763e838adc3c7ec5a7df2990ce84cad951e42721 git Not specified
CNA Linux Linux affected 5d5182cae40115c03933989473288e54afb39c7c a0b7091c4de45a7325c8780e6934a894f92ac86b git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.77 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.18 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.8 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a0b7091c4de45a7325c8780e6934a894f92ac86b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b8e77c7abab40e6de9ad9de730d77984a498840 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b6ba87579c7e7c669e0bec91823e7fb693bc5df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af782cc8871e3683ddd5a3cd2f7df526599863a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6ef1f2926c41ab96952d9696d55a052f1b3a9418 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9761add6d100962a23996cb68f3d6abdd4d1815 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d9d8560b9b7932f8cffc4c068c14289220900f79 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/763e838adc3c7ec5a7df2990ce84cad951e42721 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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