{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64226",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.771Z",
        "datePublished": "2026-07-24T15:23:10.388Z",
        "dateUpdated": "2026-08-05T12:40:11.672Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:40:11.672Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Avoid UAF in scx_root_enable_workfn() init failure path\n\nIn scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()\ndereferences p->comm and p->pid. If the iterator's reference is the last\ndrop, the task is freed synchronously and the deref becomes a UAF.\n\nMove put_task_struct() past scx_error()."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable enable path is reached locally through bpf() struct_ops map preparation and BPF_LINK_CREATE, which invokes scx_enable() and scx_root_enable_workfn().\nAC:L - The attacker can make ops.init_task() return an error for a selected task while concurrently causing that task to exit, controlling both sides of the race and allowing repeated attempts.\nPR:L - Although ordinary attachment requires init-namespace CAP_BPF and CAP_PERFMON, BPF tokens can delegate the necessary struct_ops permissions to a non-init user namespace. Under the highest defensible deployment scenario, this is reachable by a locally authorized but non-administrative user.\nUI:N - The attacker can attach the scheduler and coordinate the target task's exit without requiring another user to take any action.\nS:U - The vulnerable sched_ext code and the affected kernel memory and execution context belong to the same kernel security authority.\nC:H - The freed task_struct is dereferenced through p->comm as a string and p->pid, potentially exposing reclaimed or adjacent slab contents through the sched_ext diagnostic buffer. Consistent with the required UAF guidance, confidentiality impact is High.\nI:H - The access occurs after a task_struct slab object has been freed and can be influenced through heap reuse and spraying. Applying the required higher-severity treatment for UAF conditions, potential memory-corruption and control-flow impact warrants High.\nA:H - The stale string dereference can cause a KASAN failure, invalid-memory access, kernel oops, or panic, and the attacker can repeat the controlled failure-and-exit sequence."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/sched/ext.c"
                    ],
                    "versions": [
                        {
                            "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
                            "lessThan": "cf396941901858b0de426cdcd3974eea6a02c98c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
                            "lessThan": "45c7c4e3db8b700307313c035ea08be829a7f21b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
                            "lessThan": "57e19ba3f58a67eb924022a5a60b67fd08e5cbbd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f",
                            "lessThan": "9a415cc53711f2238e0f0ca8a6bcc796c003b127",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/sched/ext.c"
                    ],
                    "versions": [
                        {
                            "version": "6.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.92",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.34",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.11",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "6.12.92"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "6.18.34"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "7.0.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/cf396941901858b0de426cdcd3974eea6a02c98c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/45c7c4e3db8b700307313c035ea08be829a7f21b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9a415cc53711f2238e0f0ca8a6bcc796c003b127"
                }
            ],
            "title": "sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}