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CVE-2026-23408— apparmor: Fix double free of ns_name in aa_replace_profiles()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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aa_replace_profiles函数存在双重释放。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 145a0ef21c8e944957f58e2c8ffcd8a10f46266a< c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689 affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< c053ae381ce227577567d1ef10090ce7506d7a28 affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< 35f4caec1352054b9a61cfdf2bf1898073637aa0 affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< 55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162a affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< 86feeccd6b93ed94bd6655f30de80f163f8d5a45 affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< 7998ab3010d2317643f91828f1853d954ef31387 affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< 18b5233e860c294a847ee07869d93c0b8673a54b affected
145a0ef21c8e944957f58e2c8ffcd8a10f46266a< 5df0c44e8f5f619d3beb871207aded7c78414502 affected
… +10 more rows
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I. Basic Information for CVE-2026-23408

Vulnerability Information
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Vulnerability Title
apparmor: Fix double free of ns_name in aa_replace_profiles()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix double free of ns_name in aa_replace_profiles() if ns_name is NULL after 1071 error = aa_unpack(udata, &lh, &ns_name); and if ent->ns_name contains an ns_name in 1089 } else if (ent->ns_name) { then ns_name is assigned the ent->ns_name 1095 ns_name = ent->ns_name; however ent->ns_name is freed at 1262 aa_load_ent_free(ent); and then again when freeing ns_name at 1270 kfree(ns_name); Fix this by NULLing out ent->ns_name after it is transferred to ns_name ")
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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aa_replace_profiles函数存在双重释放。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 145a0ef21c8e944957f58e2c8ffcd8a10f46266a ~ c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689 -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-23408

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III. Intelligence Information for CVE-2026-23408

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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-2026-23407 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-2026-23405 apparmor: fix: limit the number of levels of policy namespaces
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
Same vendor: Linux

V. Comments for CVE-2026-23408

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