CVE-2026-23404 | Linux Kernel up to 6.6.129/6.12.76/6.18.17/6.19.7/7.0-rc3 apparmor __aa_profile_list_release recursion

VDB-354623 · CVE-2026-23404 · GCVE-0-2026-23404 LINUX KERNEL UP TO 6.6.129/6.12.76/6.18.17/6.19.7/7.0-RC3 APPARMOR __AA_PROFILE_LIST_RELEASE RECURSION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.5 $0-$5k 2.71+ Summaryinfo A vulnerability has been found in Linux Kernel up to 6.6.129/6.12.76/6.18.17/6.19.7/7.0-rc3 and classified as critical. Impacted is the function __aa_profile_list_release of the component apparmor. The manipulation leads to recursion. This vulnerability is listed as CVE-2026-23404. There is no available exploit. The affected component should be upgraded. Detailsinfo A vulnerability was found in Linux Kernel up to 6.6.129/6.12.76/6.18.17/6.19.7/7.0-rc3 and classified as critical. This issue affects the function __aa_profile_list_release of the component apparmor. The manipulation with an unknown input leads to a recursion vulnerability. Using CWE to declare the problem leads to CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Impacted is availability. The summary by CVE is: In the Linux kernel, the following vulnerability has been resolved: apparmor: replace recursive profile removal with iterative approach The profile removal code uses recursion when removing nested profiles, which can lead to kernel stack exhaustion and system crashes. Reproducer: $ pf='a'; for ((i=0; i<1024; i++)); do echo -e "profile $pf { \n }" | apparmor_parser -K -a; pf="$pf//x"; done $ echo -n a > /sys/kernel/security/apparmor/.remove Replace the recursive __aa_profile_list_release() approach with an iterative approach in __remove_profile(). The function repeatedly finds and removes leaf profiles until the entire subtree is removed, maintaining the same removal semantic without recursion. It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-23404 since 01/13/2026. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 6.6.130, 6.12.77, 6.18.18, 6.19.8 or 7.0-rc4 eliminates this vulnerability. Applying the patch 33959a491e9fd557abfa5fce5ae4637d400915d3/999bd704b0b641527a5ed46f0d969deff8cfa68b/7eade846e013cbe8d2dc4a484463aa19e6515c7f/a6a941a1294ac5abe22053dc501d25aed96e48fe/ab09264660f9de5d05d1ef4e225aa447c63a8747 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Type Operating System Vendor Linux Name Kernel Version 6.6.129 6.12.0 6.12.1 6.12.2 6.12.3 6.12.4 6.12.5 6.12.6 6.12.7 6.12.8 6.12.9 6.12.10 6.12.11 6.12.12 6.12.13 6.12.14 6.12.15 6.12.16 6.12.17 6.12.18 6.12.19 6.12.20 6.12.21 6.12.22 6.12.23 6.12.24 6.12.25 6.12.26 6.12.27 6.12.28 6.12.29 6.12.30 6.12.31 6.12.32 6.12.33 6.12.34 6.12.35 6.12.36 6.12.37 6.12.38 6.12.39 6.12.40 6.12.41 6.12.42 6.12.43 6.12.44 6.12.45 6.12.46 6.12.47 6.12.48 6.12.49 6.12.50 6.12.51 6.12.52 6.12.53 6.12.54 6.12.55 6.12.56 6.12.57 6.12.58 6.12.59 6.12.60 6.12.61 6.12.62 6.12.63 6.12.64 6.12.65 6.12.66 6.12.67 6.12.68 6.12.69 6.12.70 6.12.71 6.12.72 6.12.73 6.12.74 6.12.75 6.12.76 6.18.0 6.18.1 6.18.2 6.18.3 6.18.4 6.18.5 6.18.6 6.18.7 6.18.8 6.18.9 6.18.10 6.18.11 6.18.12 6.18.13 6.18.14 6.18.15 6.18.16 6.18.17 6.19.0 6.19.1 6.19.2 6.19.3 6.19.4 6.19.5 6.19.6 6.19.7 7.0-rc1 7.0-rc2 7.0-rc3 License open-source Website Vendor: https://www.kernel.org/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.7 VulDB Meta Temp Score: 5.5 VulDB Base Score: 5.7 VulDB Temp Score: 5.5 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Recursion CWE: CWE-674 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Kernel 6.6.130/6.12.77/6.18.18/6.19.8/7.0-rc4 Patch: 33959a491e9fd557abfa5fce5ae4637d400915d3/999bd704b0b641527a5ed46f0d969deff8cfa68b/7eade846e013cbe8d2dc4a484463aa19e6515c7f/a6a941a1294ac5abe22053dc501d25aed96e48fe/ab09264660f9de5d05d1ef4e225aa447c63a8747 Timelineinfo 01/13/2026 CVE reserved 04/01/2026 +77 days Advisory disclosed 04/01/2026 +0 days VulDB entry created 04/01/2026 +0 days VulDB entry last update Sourcesinfo Vendor: kernel.org Advisory: git.kernel.org Status: Confirmed CVE: CVE-2026-23404 (🔒) GCVE (CVE): GCVE-0-2026-23404 GCVE (VulDB): GCVE-100-354623 Entryinfo Created: 04/01/2026 11:25 Changes: 04/01/2026 11:25 (59) Complete: 🔍 Cache ID: 99:8CB:101 Discussion No comments yet. 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