{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-50223",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/numa: Fix the potential null pointer dereference in task_numa_work()\n\nWhen running stress-ng-vm-segv test, we found a null pointer dereference\nerror in task_numa_work(). Here is the backtrace:\n\n  [323676.066985] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020\n  ......\n  [323676.067108] CPU: 35 PID: 2694524 Comm: stress-ng-vm-se\n  ......\n  [323676.067113] pstate: 23401009 (nzCv daif +PAN -UAO +TCO +DIT +SSBS BTYPE=--)\n  [323676.067115] pc : vma_migratable+0x1c/0xd0\n  [323676.067122] lr : task_numa_work+0x1ec/0x4e0\n  [323676.067127] sp : ffff8000ada73d20\n  [323676.067128] x29: ffff8000ada73d20 x28: 0000000000000000 x27: 000000003e89f010\n  [323676.067130] x26: 0000000000080000 x25: ffff800081b5c0d8 x24: ffff800081b27000\n  [323676.067133] x23: 0000000000010000 x22: 0000000104d18cc0 x21: ffff0009f7158000\n  [323676.067135] x20: 0000000000000000 x19: 0000000000000000 x18: ffff8000ada73db8\n  [323676.067138] x17: 0001400000000000 x16: ffff800080df40b0 x15: 0000000000000035\n  [323676.067140] x14: ffff8000ada73cc8 x13: 1fffe0017cc72001 x12: ffff8000ada73cc8\n  [323676.067142] x11: ffff80008001160c x10: ffff000be639000c x9 : ffff8000800f4ba4\n  [323676.067145] x8 : ffff000810375000 x7 : ffff8000ada73974 x6 : 0000000000000001\n  [323676.067147] x5 : 0068000b33e26707 x4 : 0000000000000001 x3 : ffff0009f7158000\n  [323676.067149] x2 : 0000000000000041 x1 : 0000000000004400 x0 : 0000000000000000\n  [323676.067152] Call trace:\n  [323676.067153]  vma_migratable+0x1c/0xd0\n  [323676.067155]  task_numa_work+0x1ec/0x4e0\n  [323676.067157]  task_work_run+0x78/0xd8\n  [323676.067161]  do_notify_resume+0x1ec/0x290\n  [323676.067163]  el0_svc+0x150/0x160\n  [323676.067167]  el0t_64_sync_handler+0xf8/0x128\n  [323676.067170]  el0t_64_sync+0x17c/0x180\n  [323676.067173] Code: d2888001 910003fd f9000bf3 aa0003f3 (f9401000)\n  [323676.067177] SMP: stopping secondary CPUs\n  [323676.070184] Starting crashdump kernel...\n\nstress-ng-vm-segv in stress-ng is used to stress test the SIGSEGV error\nhandling function of the system, which tries to cause a SIGSEGV error on\nreturn from unmapping the whole address space of the child process.\n\nNormally this program will not cause kernel crashes. But before the\nmunmap system call returns to user mode, a potential task_numa_work()\nfor numa balancing could be added and executed. In this scenario, since the\nchild process has no vma after munmap, the vma_next() in task_numa_work()\nwill return a null pointer even if the vma iterator restarts from 0.\n\nRecheck the vma pointer before dereferencing it in task_numa_work()."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "214dbc428137",
                                            "version_value": "ade91f6e9848"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.3",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.3",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.60",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.11.7",
                                                        "lessThanOrEqual": "6.11.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.12",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef"
            },
            {
                "url": "https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee"
            },
            {
                "url": "https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209"
            }
        ]
    },
    "generator": {
        "engine": "bippy-8e903de6a542"
    }
}