{
    "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-2026-23409",
        "tracking": {
            "current_release_date": "2026-04-02T08:06:13.985156Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-23409",
            "initial_release_date": "2026-04-01T09:25:32.528619Z",
            "revision_history": [
                {
                    "date": "2026-04-01T09:25:32.528619Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| References created (5)."
                },
                {
                    "date": "2026-04-01T09:25:36.099209Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-04-01T09:38:40.252161Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (5).| Products connected (7).| References created (5)."
                },
                {
                    "date": "2026-04-01T09:38:44.384447Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T11:35:38.667797Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T12:06:09.338304Z",
                    "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": "2026-04-01T15:37:42.693454Z",
                    "number": "8",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-04-01T15:37:45.931057Z",
                    "number": "9",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T18:43:42.146672Z",
                    "number": "10",
                    "summary": "Source created.| CVE status created. (valid)| Products connected (2).| Product Identifiers created (2)."
                },
                {
                    "date": "2026-04-02T00:27:51.501081Z",
                    "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": "2026-04-02T00:28:05.523650Z",
                    "number": "12",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-02T06:44:41.965192Z",
                    "number": "13",
                    "summary": "Description created for source."
                },
                {
                    "date": "2026-04-02T08:05:51.256791Z",
                    "number": "14",
                    "summary": "Products connected (1).| References created (1)."
                },
                {
                    "date": "2026-04-02T08:05:52.968955Z",
                    "number": "15",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "15"
        }
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    "vulnerabilities": [
        {
            "cve": "CVE-2026-23409",
            "notes": [
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix differential encoding verification\n\nDifferential encoding allows loops to be created if it is abused. To\nprevent this the unpack should verify that a diff-encode chain\nterminates.\n\nUnfortunately the differential encode verification had two bugs.\n\n1. it conflated states that had gone through check and already been\n   marked, with states that were currently being checked and marked.\n   This means that loops in the current chain being verified are treated\n   as a chain that has already been verified.\n\n2. the order bailout on already checked states compared current chain\n   check iterators j,k instead of using the outer loop iterator i.\n   Meaning a step backwards in states in the current chain verification\n   was being mistaken for moving to an already verified state.\n\nMove to a double mark scheme where already verified states get a\ndifferent mark, than the current chain being kept. This enables us\nto also drop the backwards verification check that was the cause of\nthe second error as any already verified state is already marked.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23409"
                },
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix differential encoding verification\n\nDifferential encoding allows loops to be created if it is abused. To\nprevent this the unpack should verify that a diff-encode chain\nterminates.\n\nUnfortunately the differential encode verification had two bugs.\n\n1. it conflated states that had gone through check and already been\n   marked, with states that were currently being checked and marked.\n   This means that loops in the current chain being verified are treated\n   as a chain that has already been verified.\n\n2. the order bailout on already checked states compared current chain\n   check iterators j,k instead of using the outer loop iterator i.\n   Meaning a step backwards in states in the current chain verification\n   was being mistaken for moving to an already verified state.\n\nMove to a double mark scheme where already verified states get a\ndifferent mark, than the current chain being kept. This enables us\nto also drop the backwards verification check that was the cause of\nthe second error as any already verified state is already marked.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23409.json"
                },
                {
                    "category": "description",
                    "text": "A flaw was found in AppArmor, a security module in the Linux kernel. This vulnerability occurs due to incorrect verification of differential encoding chains, which are designed to prevent malicious loops. An attacker could exploit this flaw by crafting a specially designed differential encoding chain, causing the system to misinterpret it as already verified. This could lead to a bypass of security policies and potentially result in unexpected system behavior or a denial of service.",
                    "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23409.json"
                },
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:  apparmor: fix differential encoding verification  Differential encoding allows loops to be created if it is abused. To prevent this the unpack should verify that a diff-encode chain terminates.  Unfortunately the differential encode verification had two bugs.  1. it conflated states that had gone through check and already been    marked, with states that were currently being checked and marked.    This means that loops in the current chain being verified are treated    as a chain that has already been verified.  2. the order bailout on already checked states compared current chain    check iterators j,k instead of using the outer loop iterator i.    Meaning a step backwards in states in the current chain verification    was being mistaken for moving to an already verified state.  Move to a double mark scheme where already verified states get a different mark, than the current chain being kept. This enables us to also drop the backwards verification check that was the cause of the second error as any already verified state is already marked.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-23409"
                },
                {
                    "category": "other",
                    "text": "0.00018",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "3.9",
                    "title": "NCSC Score"
                },
                {
                    "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"
                }
            ],
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                    "CSAFPID-5812295",
                    "CSAFPID-5815374"
                ],
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                    "CSAFPID-5971757",
                    "CSAFPID-5971758",
                    "CSAFPID-5971759",
                    "CSAFPID-5971760",
                    "CSAFPID-5971761",
                    "CSAFPID-1330297",
                    "CSAFPID-1317177"
                ],
                "known_not_affected": [
                    "CSAFPID-1286709",
                    "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-2026-23409"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23409.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-2026-23409"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23409.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/1ff4857fac56ac5a90ee63b24db05fa5e91a45aa"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/34fc60b125ed1d4eb002c76b0664bf0619492167"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/39440b137546a3aa383cfdabc605fb73811b6093"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/623a9d211bbbb031bb1cbdb38b23487648167f8a"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/f90e3ecd9e1ed69f1a370f866ceed1f104f3ab4a"
                },
                {
                    "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-2026-23409"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23409"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://lore.kernel.org/linux-cve-announce/2026040113-CVE-2026-23409-ae18@gregkh/T"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://linux.oracle.com/errata/ELSA-2026-50170.html"
                }
            ],
            "title": "CVE-2026-23409"
        }
    ]
}