CVE-2026-23405— apparmor: fix: limit the number of levels of policy namespaces
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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
II. Public POCs for CVE-2026-23405
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Same Patch Batch · Linux · 2026-04-01 · 11 CVEs total
| CVE-2026-23411 | 7.8 HIGH | apparmor: fix race between freeing data and fs accessing it |
| CVE-2026-23410 | 7.8 HIGH | apparmor: fix race on rawdata dereference |
| CVE-2026-23408 | 7.8 HIGH | apparmor: Fix double free of ns_name in aa_replace_profiles() |
| CVE-2026-23407 | 7.8 HIGH | apparmor: fix missing bounds check on DEFAULT table in verify_dfa() |
| CVE-2026-23406 | 7.8 HIGH | apparmor: fix side-effect bug in match_char() macro usage |
| CVE-2026-23409 | apparmor: fix differential encoding verification | |
| CVE-2026-23404 | apparmor: replace recursive profile removal with iterative approach | |
| CVE-2026-23403 | apparmor: fix memory leak in verify_header | |
| CVE-2026-23402 | KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE | |
| CVE-2026-23401 | KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-23405
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