{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50223",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50223"
  ],
  "published": "2024-11-09T10:15:51Z",
  "summary": "sched/numa: Fix the potential null pointer dereference in task_numa_work()",
  "details": "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().",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.6.51-1+rpt2",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50223"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}