{
    "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-2026-23403",
        "tracking": {
            "current_release_date": "2026-04-02T08:07:54.506814Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-23403",
            "initial_release_date": "2026-04-01T09:25:20.735751Z",
            "revision_history": [
                {
                    "date": "2026-04-01T09:25:20.735751Z",
                    "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": "2026-04-01T09:38:53.752505Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (5).| Products connected (7).| References created (5)."
                },
                {
                    "date": "2026-04-01T09:38:57.960338Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T11:36:06.411433Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T12:06:06.351667Z",
                    "number": "6",
                    "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (14)."
                },
                {
                    "date": "2026-04-01T12:06:18.250491Z",
                    "number": "7",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T15:37:44.873543Z",
                    "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": "2026-04-01T18:43:48.206661Z",
                    "number": "10",
                    "summary": "Source created.| CVE status created. (valid)| Products connected (2).| Product Identifiers created (2)."
                },
                {
                    "date": "2026-04-02T00:28:43.686792Z",
                    "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": "2026-04-02T06:44:46.413432Z",
                    "number": "12",
                    "summary": "Description created for source."
                },
                {
                    "date": "2026-04-02T08:05:48.171621Z",
                    "number": "13",
                    "summary": "Products connected (1).| References created (1)."
                },
                {
                    "date": "2026-04-02T08:05:50.371256Z",
                    "number": "14",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "14"
        }
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    "vulnerabilities": [
        {
            "cve": "CVE-2026-23403",
            "cwe": {
                "id": "CWE-763",
                "name": "Release of Invalid Pointer or Reference"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix memory leak in verify_header\n\nThe function sets `*ns = NULL` on every call, leaking the namespace\nstring allocated in previous iterations when multiple profiles are\nunpacked. This also breaks namespace consistency checking since *ns\nis always NULL when the comparison is made.\n\nRemove the incorrect assignment.\nThe caller (aa_unpack) initializes *ns to NULL once before the loop,\nwhich is sufficient.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23403"
                },
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix memory leak in verify_header\n\nThe function sets `*ns = NULL` on every call, leaking the namespace\nstring allocated in previous iterations when multiple profiles are\nunpacked. This also breaks namespace consistency checking since *ns\nis always NULL when the comparison is made.\n\nRemove the incorrect assignment.\nThe caller (aa_unpack) initializes *ns to NULL once before the loop,\nwhich is sufficient.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23403.json"
                },
                {
                    "category": "description",
                    "text": "A flaw was found in AppArmor within the Linux kernel. This vulnerability, located in the verify_header function, causes a memory leak by incorrectly handling namespace strings when multiple security profiles are processed. This can lead to a gradual depletion of system memory, potentially impacting system stability and the integrity of security policy enforcement.",
                    "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23403.json"
                },
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:  apparmor: fix memory leak in verify_header  The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made.  Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-23403"
                },
                {
                    "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"
                }
            ],
            "product_status": {
                "first_fixed": [
                    "CSAFPID-5812295",
                    "CSAFPID-5815374"
                ],
                "known_affected": [
                    "CSAFPID-1336344",
                    "CSAFPID-5971801",
                    "CSAFPID-5971802",
                    "CSAFPID-5971803",
                    "CSAFPID-5971804",
                    "CSAFPID-5971805",
                    "CSAFPID-1330297",
                    "CSAFPID-1317177"
                ],
                "known_not_affected": [
                    "CSAFPID-1336345",
                    "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-2026-23403"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23403.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-2026-23403"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23403.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/42fd831abfc15d0643c14688f0522556b347e7e6"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/4f0889f2df1ab99224a5e1ac4e20437eea5fe38e"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/663ce34786e759ebcbeb3060685c20bcc886d51a"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/786e2c2a87d9c505f33321d1fd23a176aa8ddeb1"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/e38c55d9f834e5b848bfed0f5c586aaf45acb825"
                },
                {
                    "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-2026-23403"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23403"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://lore.kernel.org/linux-cve-announce/2026040111-CVE-2026-23403-f22c@gregkh/T"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://linux.oracle.com/errata/ELSA-2026-50170.html"
                }
            ],
            "title": "CVE-2026-23403"
        }
    ]
}