apparmor: fix unconfined user namespace restriction forced stack

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90231
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:18 UTC
Updated2026-09-18 18:17:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: apparmor: fix unconfined user namespace restriction forced stack If a task is already confined by a stack the unprivileged transition restriction on unconfined is not correctly, applied. This results in an escape if two transitions through an unconfined profile can be executed. Fix this by pushing the check into the per profile label build. The check will always be done against unconfined and result in a stack of just the unconfined component when necessary.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001580000 probability, percentile 0.053640000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc 7d1099b86356df81c379159bfb8a598aaf83ce81 git Not specified
CNA Linux Linux affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc 7da0bdf0610f6d35bbb061536a47fc41646306f0 git Not specified
CNA Linux Linux affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc 08c2f7c8d4b1434cfae006f3daf4d1bce330b57b git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7da0bdf0610f6d35bbb061536a47fc41646306f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7d1099b86356df81c379159bfb8a598aaf83ce81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08c2f7c8d4b1434cfae006f3daf4d1bce330b57b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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