{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-23404", "tracking": { "current_release_date": "2026-04-02T08:06:23.795172Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-23404", "initial_release_date": "2026-04-01T09:25:20.100455Z", "revision_history": [ { "date": "2026-04-01T09:25:20.100455Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| References created (5)." }, { "date": "2026-04-01T09:25:29.346507Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-04-01T09:38:52.207808Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (5).| Products connected (7).| References created (5)." }, { "date": "2026-04-01T09:38:55.329661Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-04-01T11:35:53.556044Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-04-01T12:06:06.755447Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (14)." }, { "date": "2026-04-01T12:06:16.615963Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-04-01T15:37:44.600996Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-04-01T15:37:47.488928Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-04-01T18:43:47.509990Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-04-02T00:29:03.722107Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (13).| Product Identifiers created (5).| References created (3).| CWES updated (1)." }, { "date": "2026-04-02T00:29:15.578363Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-04-02T06:44:45.722652Z", "number": "13", "summary": "Description created for source." }, { "date": "2026-04-02T08:05:48.983773Z", "number": "14", "summary": "Products connected (1).| References created (1)." } ], "status": "interim", "version": "14" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92|<33959a491e9fd557abfa5fce5ae4637d400915d3", "product": { "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92|<33959a491e9fd557abfa5fce5ae4637d400915d3", "product_id": "CSAFPID-5971796" } }, { "category": "product_version_range", "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92|<7eade846e013cbe8d2dc4a484463aa19e6515c7f", "product": { "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92|<7eade846e013cbe8d2dc4a484463aa19e6515c7f", "product_id": "CSAFPID-5971798" } }, { "category": "product_version_range", "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92|<999bd704b0b641527a5ed46f0d969deff8cfa68b", "product": { "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92|<999bd704b0b641527a5ed46f0d969deff8cfa68b", "product_id": "CSAFPID-5971797" } }, { "category": "product_version_range", "name": "vers:git/c88d4c7b049e87998ac0a9f455aa545cc895ef92| /sys/kernel/security/apparmor/.remove\n\nReplace the recursive __aa_profile_list_release() approach with an\niterative approach in __remove_profile(). The function repeatedly\nfinds and removes leaf profiles until the entire subtree is removed,\nmaintaining the same removal semantic without recursion.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23404" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: replace recursive profile removal with iterative approach\n\nThe profile removal code uses recursion when removing nested profiles,\nwhich can lead to kernel stack exhaustion and system crashes.\n\nReproducer:\n $ pf='a'; for ((i=0; i<1024; i++)); do\n echo -e \"profile $pf { \\n }\" | apparmor_parser -K -a;\n pf=\"$pf//x\";\n done\n $ echo -n a > /sys/kernel/security/apparmor/.remove\n\nReplace the recursive __aa_profile_list_release() approach with an\niterative approach in __remove_profile(). The function repeatedly\nfinds and removes leaf profiles until the entire subtree is removed,\nmaintaining the same removal semantic without recursion.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23404.json" }, { "category": "description", "text": "A flaw was found in the Linux kernel's AppArmor security module. A local user could trigger a denial of service by initiating a recursive profile removal operation with deeply nested profiles. This recursive process can lead to kernel stack exhaustion, causing the system to crash.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23404.json" }, { "category": "description", "text": "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.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-23404" }, { "category": "other", "text": "0.00018", "title": "EPSS" }, { "category": "other", "text": "3.7", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to a product by vendor Linux, The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" } ], "product_status": { "first_fixed": [ "CSAFPID-5812295", "CSAFPID-5815374" ], "known_affected": [ "CSAFPID-1287215", "CSAFPID-5971796", "CSAFPID-5971797", "CSAFPID-5971798", "CSAFPID-5971799", "CSAFPID-5971800", "CSAFPID-1330297", "CSAFPID-1317177" ], "known_not_affected": [ "CSAFPID-1287216", "CSAFPID-5815258", "CSAFPID-5843471", "CSAFPID-5843472", "CSAFPID-5844856", "CSAFPID-5904647", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1453376", "CSAFPID-1453377", "CSAFPID-1453378", "CSAFPID-1453379", "CSAFPID-1453380", "CSAFPID-1453381", "CSAFPID-1453382", "CSAFPID-2858634", "CSAFPID-2858635" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23404" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23404.json" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0950.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-23404" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23404.json" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/33959a491e9fd557abfa5fce5ae4637d400915d3" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/7eade846e013cbe8d2dc4a484463aa19e6515c7f" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/999bd704b0b641527a5ed46f0d969deff8cfa68b" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/a6a941a1294ac5abe22053dc501d25aed96e48fe" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/ab09264660f9de5d05d1ef4e225aa447c63a8747" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0950.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0950" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040108-CVE-2026-23401-956d@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040110-CVE-2026-23402-c852@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040111-CVE-2026-23403-f22c@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040111-CVE-2026-23404-8b0b@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040111-CVE-2026-23405-0e7a@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040112-CVE-2026-23406-0cb2@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040112-CVE-2026-23407-297e@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040113-CVE-2026-23408-1932@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040113-CVE-2026-23409-ae18@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040113-CVE-2026-23410-d7d5@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026040114-CVE-2026-23411-00f7@gregkh/" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-23404" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23404" }, { "category": "external", "summary": "Reference - redhat", "url": "https://lore.kernel.org/linux-cve-announce/2026040111-CVE-2026-23404-8b0b@gregkh/T" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-50170.html" } ], "title": "CVE-2026-23404" } ] }