apparmor: fix: limit the number of levels of policy namespaces
Summary
| CVE | CVE-2026-23405 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-01 09:16:16 UTC |
| Updated | 2026-04-18 09:16:24 UTC |
| 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. |
Risk And Classification
EPSS: 0.000320000 probability, percentile 0.092520000 (date 2026-04-21)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 6b396cc2f0365e684fc1d3547d18ef79fcee225d git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3 git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 b1226e37eb3754d389721c135db6107db94c7a72 git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 853ce31ca72097d23991a06876a2ccb5cb64b603 git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 d42b2b6bb77ca40ee34ab74ad79305840b5f315d git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 7b6495ead2c611647f6b11441a852324e3eb8616 git | Not specified |
| CNA | Linux | Linux | affected c88d4c7b049e87998ac0a9f455aa545cc895ef92 306039414932c80f8420695a24d4fe10c84ccfb2 git | Not specified |
| CNA | Linux | Linux | affected 2.6.36 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.36 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
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/b1226e37eb3754d389721c135db6107db94c7a72 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6b396cc2f0365e684fc1d3547d18ef79fcee225d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.