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CVE-2026-23403— apparmor: fix memory leak in verify_header

EPSS 0.01% · P3
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I. Basic Information for CVE-2026-23403

Vulnerability Information
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Vulnerability Title
apparmor: fix memory leak in verify_header
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix memory leak in verify_header The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made. Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.
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verify_header函数存在内存泄漏。
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 dd51c84857630e77c139afe4d9bba65fc051dc3f ~ 9d678eb0fe55c9195d9a253e8c5b82a87b930737 -
LinuxLinux 3.12 -

II. Public POCs for CVE-2026-23403

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III. Intelligence Information for CVE-2026-23403

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Same Patch Batch · Linux · 2026-04-01 · 11 CVEs total

CVE-2026-234117.8 HIGHapparmor: fix race between freeing data and fs accessing it
CVE-2026-234107.8 HIGHapparmor: fix race on rawdata dereference
CVE-2026-234087.8 HIGHapparmor: Fix double free of ns_name in aa_replace_profiles()
CVE-2026-234077.8 HIGHapparmor: fix missing bounds check on DEFAULT table in verify_dfa()
CVE-2026-234067.8 HIGHapparmor: fix side-effect bug in match_char() macro usage
CVE-2026-23409apparmor: fix differential encoding verification
CVE-2026-23405apparmor: fix: limit the number of levels of policy namespaces
CVE-2026-23404apparmor: replace recursive profile removal with iterative approach
CVE-2026-23402KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE
CVE-2026-23401KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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