apparmor: fix unprivileged local user can do privileged policy management

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Summary

CVECVE-2026-23268
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-18 18:16:25 UTC
Updated2026-04-18 09:16:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An unprivileged local user can load, replace, and remove profiles by opening the apparmorfs interfaces, via a confused deputy attack, by passing the opened fd to a privileged process, and getting the privileged process to write to the interface. This does require a privileged target that can be manipulated to do the write for the unprivileged process, but once such access is achieved full policy management is possible and all the possible implications that implies: removing confinement, DoS of system or target applications by denying all execution, by-passing the unprivileged user namespace restriction, to exploiting kernel bugs for a local privilege escalation. The policy management interface can not have its permissions simply changed from 0666 to 0600 because non-root processes need to be able to load policy to different policy namespaces. Instead ensure the task writing the interface has privileges that are a subset of the task that opened the interface. This is already done via policy for confined processes, but unconfined can delegate access to the opened fd, by-passing the usual policy check.

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 0.046260000 (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 b7fd2c0340eacbee892425e9007647568b7f2a3c a407a078cd41b5261b99d822af784bd9f136eb4d git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c 4cafce4d6d0a66ec27e3af5637c11901d60189fa git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c 33ee909702e047c94aaf41d4eea35626d509802c git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c 17debf5586020790b5717f96e5e6a3ca5bb961ab git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c 0fc63dd9170643d15c25681fca792539e23f4640 git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6 git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c b6a94eeca9c6c8f7c55ad44c62c98324f51ec596 git Not specified
CNA Linux Linux affected b7fd2c0340eacbee892425e9007647568b7f2a3c 6601e13e82841879406bf9f369032656f441a425 git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 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/a407a078cd41b5261b99d822af784bd9f136eb4d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33ee909702e047c94aaf41d4eea35626d509802c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6601e13e82841879406bf9f369032656f441a425 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
www.qualys.com/2026/03/10/crack-armor.txt 416baaa9-dc9f-4396-8d5f-8c081fb06d67 www.qualys.com
git.kernel.org/stable/c/b6a94eeca9c6c8f7c55ad44c62c98324f51ec596 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0fc63dd9170643d15c25681fca792539e23f4640 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4cafce4d6d0a66ec27e3af5637c11901d60189fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17debf5586020790b5717f96e5e6a3ca5bb961ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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