{
    "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-2026-23400",
        "tracking": {
            "current_release_date": "2026-03-31T00:11:09.103833Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-23400",
            "initial_release_date": "2026-03-29T13:25:03.189681Z",
            "revision_history": [
                {
                    "date": "2026-03-29T13:25:03.189681Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| References created (3)."
                },
                {
                    "date": "2026-03-29T13:25:06.853126Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-29T13:38:59.090561Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (3).| Products connected (5).| References created (3)."
                },
                {
                    "date": "2026-03-29T13:39:04.512694Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-29T18:44:19.025281Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Products connected (2)."
                },
                {
                    "date": "2026-03-30T00:27:38.893418Z",
                    "number": "6",
                    "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": "2026-03-30T12:07:02.127541Z",
                    "number": "7",
                    "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (5)."
                },
                {
                    "date": "2026-03-30T12:07:07.609971Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-31T00:07:10.586866Z",
                    "number": "9",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-31T00:07:14.383743Z",
                    "number": "10",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "10"
        }
    },
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                                            "product_id": "CSAFPID-2858635"
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                        "name": "bullseye"
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    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-23400",
            "cwe": {
                "id": "CWE-833",
                "name": "Deadlock"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust_binder: call set_notification_done() without proc lock\n\nConsider the following sequence of events on a death listener:\n1. The remote process dies and sends a BR_DEAD_BINDER message.\n2. The local process invokes the BC_CLEAR_DEATH_NOTIFICATION command.\n3. The local process then invokes the BC_DEAD_BINDER_DONE.\nThen, the kernel will reply to the BC_DEAD_BINDER_DONE command with a\nBR_CLEAR_DEATH_NOTIFICATION_DONE reply using push_work_if_looper().\n\nHowever, this can result in a deadlock if the current thread is not a\nlooper. This is because dead_binder_done() still holds the proc lock\nduring set_notification_done(), which called push_work_if_looper().\nNormally, push_work_if_looper() takes the thread lock, which is fine to\ntake under the proc lock. But if the current thread is not a looper,\nthen it falls back to delivering the reply to the process work queue,\nwhich involves taking the proc lock. Since the proc lock is already\nheld, this is a deadlock.\n\nFix this by releasing the proc lock during set_notification_done(). It\nwas not intentional that it was held during that function to begin with.\n\nI don't think this ever happens in Android because BC_DEAD_BINDER_DONE\nis only invoked in response to BR_DEAD_BINDER messages, and the kernel\nalways delivers BR_DEAD_BINDER to a looper. So there's no scenario where\nAndroid userspace will call BC_DEAD_BINDER_DONE on a non-looper thread.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23400"
                },
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust_binder: call set_notification_done() without proc lock\n\nConsider the following sequence of events on a death listener:\n1. The remote process dies and sends a BR_DEAD_BINDER message.\n2. The local process invokes the BC_CLEAR_DEATH_NOTIFICATION command.\n3. The local process then invokes the BC_DEAD_BINDER_DONE.\nThen, the kernel will reply to the BC_DEAD_BINDER_DONE command with a\nBR_CLEAR_DEATH_NOTIFICATION_DONE reply using push_work_if_looper().\n\nHowever, this can result in a deadlock if the current thread is not a\nlooper. This is because dead_binder_done() still holds the proc lock\nduring set_notification_done(), which called push_work_if_looper().\nNormally, push_work_if_looper() takes the thread lock, which is fine to\ntake under the proc lock. But if the current thread is not a looper,\nthen it falls back to delivering the reply to the process work queue,\nwhich involves taking the proc lock. Since the proc lock is already\nheld, this is a deadlock.\n\nFix this by releasing the proc lock during set_notification_done(). It\nwas not intentional that it was held during that function to begin with.\n\nI don't think this ever happens in Android because BC_DEAD_BINDER_DONE\nis only invoked in response to BR_DEAD_BINDER messages, and the kernel\nalways delivers BR_DEAD_BINDER to a looper. So there's no scenario where\nAndroid userspace will call BC_DEAD_BINDER_DONE on a non-looper thread.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23400.json"
                },
                {
                    "category": "description",
                    "text": "A flaw was found in the Linux kernel's rust_binder component. A local user could potentially trigger a deadlock condition. This occurs when the set_notification_done() function is called while the proc lock is already held and the current thread is not a 'looper' (a thread designed to handle specific kernel messages). This can lead to a system freeze, causing a Denial of Service (DoS).",
                    "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23400.json"
                },
                {
                    "category": "other",
                    "text": "0.00017",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "3.9",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "There is product data available from source Certbundde",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent EPSS score, Is related to a product by vendor Linux, The value of the most recent CVSS (V3) score, Is related to a product by vendor Open Source",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5271420",
                    "CSAFPID-5961783",
                    "CSAFPID-5961784",
                    "CSAFPID-5961785",
                    "CSAFPID-1330297"
                ],
                "known_not_affected": [
                    "CSAFPID-5271421",
                    "CSAFPID-5844856",
                    "CSAFPID-5874533",
                    "CSAFPID-5874534",
                    "CSAFPID-2036022",
                    "CSAFPID-2036023",
                    "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-2026-23400"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23400.json"
                },
                {
                    "category": "external",
                    "summary": "Source - debian",
                    "url": "https://security-tracker.debian.org/tracker/CVE-2026-23400"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23400.json"
                },
                {
                    "category": "external",
                    "summary": "Source - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0910.json"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/2e303f0febb65a434040774b793ba8356698802b"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/3be72099067d2cd4a0e089696f19780f75b2b88a"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/dd109e3442817bc03ad1f3ffd541092f8c428141"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-23400"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23400"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://lore.kernel.org/linux-cve-announce/2026032953-CVE-2026-23400-b75a@gregkh/T"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0910.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0910"
                },
                {
                    "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/2026032820-CVE-2026-23399-60d0@gregkh/"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://lore.kernel.org/linux-cve-announce/2026032953-CVE-2026-23400-b75a@gregkh/"
                }
            ],
            "title": "CVE-2026-23400"
        }
    ]
}