{
    "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-2026-23425",
        "tracking": {
            "current_release_date": "2026-04-03T16:12:46.096354Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-23425",
            "initial_release_date": "2026-04-03T14:27:13.827566Z",
            "revision_history": [
                {
                    "date": "2026-04-03T14:27:13.827566Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| References created (3)."
                },
                {
                    "date": "2026-04-03T14:27:16.450158Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-04-03T14:40:13.368171Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (3).| Products connected (5).| References created (3)."
                },
                {
                    "date": "2026-04-03T14:40:22.862381Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-03T16:05:48.080361Z",
                    "number": "5",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "5"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:git/41d6028e28bd474298ff10409c292ec46cf43a90|<7e7c2cf0024d89443a7af52e09e47b1fe634ab17",
                                "product": {
                                    "name": "vers:git/41d6028e28bd474298ff10409c292ec46cf43a90|<7e7c2cf0024d89443a7af52e09e47b1fe634ab17",
                                    "product_id": "CSAFPID-5992131"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:git/41d6028e28bd474298ff10409c292ec46cf43a90|<858620655c1fbff05997e162fc7d83a3293d5142",
                                "product": {
                                    "name": "vers:git/41d6028e28bd474298ff10409c292ec46cf43a90|<858620655c1fbff05997e162fc7d83a3293d5142",
                                    "product_id": "CSAFPID-5992130"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:git/41d6028e28bd474298ff10409c292ec46cf43a90|<bce3847f7c51b86332bf2e554c9e80ca3820f16c",
                                "product": {
                                    "name": "vers:git/41d6028e28bd474298ff10409c292ec46cf43a90|<bce3847f7c51b86332bf2e554c9e80ca3820f16c",
                                    "product_id": "CSAFPID-5992129"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:semver/6.18.17|<=6.18.*",
                                "product": {
                                    "name": "vers:semver/6.18.17|<=6.18.*",
                                    "product_id": "CSAFPID-5843428"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:semver/6.19.7|<=6.19.*",
                                "product": {
                                    "name": "vers:semver/6.19.7|<=6.19.*",
                                    "product_id": "CSAFPID-5843429"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:semver/<6.14",
                                "product": {
                                    "name": "vers:semver/<6.14",
                                    "product_id": "CSAFPID-2727124"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/6.14",
                                "product": {
                                    "name": "vers:unknown/6.14",
                                    "product_id": "CSAFPID-2727123"
                                }
                            },
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/7.0-rc2|<=*",
                                "product": {
                                    "name": "vers:unknown/7.0-rc2|<=*",
                                    "product_id": "CSAFPID-5776393"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Linux"
                    }
                ],
                "category": "vendor",
                "name": "Linux"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-23425",
            "notes": [
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix ID register initialization for non-protected pKVM guests\n\nIn protected mode, the hypervisor maintains a separate instance of\nthe `kvm` structure for each VM. For non-protected VMs, this structure is\ninitialized from the host's `kvm` state.\n\nCurrently, `pkvm_init_features_from_host()` copies the\n`KVM_ARCH_FLAG_ID_REGS_INITIALIZED` flag from the host without the\nunderlying `id_regs` data being initialized. This results in the\nhypervisor seeing the flag as set while the ID registers remain zeroed.\n\nConsequently, `kvm_has_feat()` checks at EL2 fail (return 0) for\nnon-protected VMs. This breaks logic that relies on feature detection,\nsuch as `ctxt_has_tcrx()` for TCR2_EL1 support. As a result, certain\nsystem registers (e.g., TCR2_EL1, PIR_EL1, POR_EL1) are not\nsaved/restored during the world switch, which could lead to state\ncorruption.\n\nFix this by explicitly copying the ID registers from the host `kvm` to\nthe hypervisor `kvm` for non-protected VMs during initialization, since\nwe trust the host with its non-protected guests' features. Also ensure\n`KVM_ARCH_FLAG_ID_REGS_INITIALIZED` is cleared initially in\n`pkvm_init_features_from_host` so that `vm_copy_id_regs` can properly\ninitialize them and set the flag once done.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23425"
                },
                {
                    "category": "description",
                    "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix ID register initialization for non-protected pKVM guests\n\nIn protected mode, the hypervisor maintains a separate instance of\nthe `kvm` structure for each VM. For non-protected VMs, this structure is\ninitialized from the host's `kvm` state.\n\nCurrently, `pkvm_init_features_from_host()` copies the\n`KVM_ARCH_FLAG_ID_REGS_INITIALIZED` flag from the host without the\nunderlying `id_regs` data being initialized. This results in the\nhypervisor seeing the flag as set while the ID registers remain zeroed.\n\nConsequently, `kvm_has_feat()` checks at EL2 fail (return 0) for\nnon-protected VMs. This breaks logic that relies on feature detection,\nsuch as `ctxt_has_tcrx()` for TCR2_EL1 support. As a result, certain\nsystem registers (e.g., TCR2_EL1, PIR_EL1, POR_EL1) are not\nsaved/restored during the world switch, which could lead to state\ncorruption.\n\nFix this by explicitly copying the ID registers from the host `kvm` to\nthe hypervisor `kvm` for non-protected VMs during initialization, since\nwe trust the host with its non-protected guests' features. Also ensure\n`KVM_ARCH_FLAG_ID_REGS_INITIALIZED` is cleared initially in\n`pkvm_init_features_from_host` so that `vm_copy_id_regs` can properly\ninitialize them and set the flag once done.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23425.json"
                },
                {
                    "category": "other",
                    "text": "4.3",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "Is related to a product by vendor Linux",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-2727123",
                    "CSAFPID-5992129",
                    "CSAFPID-5992130",
                    "CSAFPID-5992131"
                ],
                "known_not_affected": [
                    "CSAFPID-2727124",
                    "CSAFPID-5776393",
                    "CSAFPID-5843428",
                    "CSAFPID-5843429"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23425"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23425.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/7e7c2cf0024d89443a7af52e09e47b1fe634ab17"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/858620655c1fbff05997e162fc7d83a3293d5142"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://git.kernel.org/stable/c/bce3847f7c51b86332bf2e554c9e80ca3820f16c"
                }
            ],
            "title": "CVE-2026-23425"
        }
    ]
}