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I. Basic Information for CVE-2026-23405
Vulnerability Information

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Vulnerability Title
apparmor: fix: limit the number of levels of policy namespaces
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞,该漏洞源于策略命名空间层级数量未限制,可能导致耗尽系统资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
LinuxLinux c88d4c7b049e87998ac0a9f455aa545cc895ef92 ~ 6b396cc2f0365e684fc1d3547d18ef79fcee225d -
LinuxLinux 2.6.36 -
II. Public POCs for CVE-2026-23405
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III. Intelligence Information for CVE-2026-23405
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IV. Related Vulnerabilities
V. Comments for CVE-2026-23405

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