CVE-2026-23408
Received Received - Intake
Double Free Vulnerability in Linux AppArmor ns_name Handling

Publication date: 2026-04-01

Last updated on: 2026-04-24

Assigner: kernel.org

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 ")
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Meta Information
Published
2026-04-01
Last Modified
2026-04-24
Generated
2026-06-16
AI Q&A
2026-04-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23408
EUVD
EUVD-2026-17837
Affected Vendors & Products
Showing 15 associated CPEs
Vendor Product Version / Range
linux linux_kernel 5.5
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.2 (inc) to 6.6.130 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.77 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.203 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.169 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.18 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.8 (exc)
linux linux_kernel From 5.5.1 (inc) to 5.10.253 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-415 The product calls free() twice on the same memory address.
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Executive Summary

This vulnerability is a double free issue in the Linux kernel's AppArmor component, specifically in the function aa_replace_profiles().

The problem occurs when a variable ns_name is assigned a value from ent->ns_name, but ent->ns_name is freed later and then ns_name is freed again, causing a double free.

The fix involves setting ent->ns_name to NULL after its value is transferred to ns_name to prevent freeing the same memory twice.

Impact Analysis

This vulnerability involves a double free error in the Linux kernel's AppArmor component, specifically in the aa_replace_profiles() function. A double free can lead to memory corruption, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges.

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