CVE-2026-23405 Details
Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix: limit the number of levels of policy namespaces Currently the number of policy namespaces is not bounded relying on the user namespace limit. However policy namespaces aren't strictly tied to user namespaces and it is possible to create them and nest them arbitrarily deep which can be used to exhaust system resource. Hard cap policy namespaces to the same depth as user namespaces.
A vulnerability in the Linux kernel's AppArmor implementation allows for the creation of policy namespaces that can be nested arbitrarily deep. This unbounded nesting can exhaust system resources. The issue arises because policy namespaces are not strictly tied to user namespaces, leading to potential resource exhaustion. The vulnerability affects the Linux kernel through the stable branch.
The vulnerability has been addressed by introducing a hard cap on the depth of policy namespaces, limiting them to the same maximum depth as user namespaces.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2 | kernel.org | Patch |
| https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e | kernel.org | Patch |
| https://git.kernel.org/stable/c/6b396cc2f0365e684fc1d3547d18ef79fcee225d | kernel.org | Patch |
| https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616 | kernel.org | Patch |
| https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603 | kernel.org | Patch |
| https://git.kernel.org/stable/c/87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b1226e37eb3754d389721c135db6107db94c7a72 | kernel.org | Patch |
| https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.36.1, < 5.10.253 >= 5.11, < 5.15.203 >= 5.16, < 6.1.169 >= 6.2, < 6.6.130 >= 6.7, < 6.12.77 >= 6.13, < 6.18.18 >= 6.19, < 6.19.8 2.6.36 - 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 7.0 rc7 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Apr 24, 2026 | Initial Analysis | [email protected] |
| Apr 18, 2026 | CVE Modified | kernel.org |
| Apr 1, 2026 | New CVE Received | kernel.org |