{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50140",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50140"
  ],
  "published": "2024-11-07T09:34:57Z",
  "summary": "sched/core: Disable page allocation in task_tick_mm_cid()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Disable page allocation in task_tick_mm_cid()\n\nWith KASAN and PREEMPT_RT enabled, calling task_work_add() in\ntask_tick_mm_cid() may cause the following splat.\n\n[   63.696416] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n[   63.696416] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 610, name: modprobe\n[   63.696416] preempt_count: 10001, expected: 0\n[   63.696416] RCU nest depth: 1, expected: 1\n\nThis problem is caused by the following call trace.\n\n  sched_tick() [ acquire rq->__lock ]\n   -> task_tick_mm_cid()\n    -> task_work_add()\n     -> __kasan_record_aux_stack()\n      -> kasan_save_stack()\n       -> stack_depot_save_flags()\n        -> alloc_pages_mpol_noprof()\n         -> __alloc_pages_noprof()\n\t  -> get_page_from_freelist()\n\t   -> rmqueue()\n\t    -> rmqueue_pcplist()\n\t     -> __rmqueue_pcplist()\n\t      -> rmqueue_bulk()\n\t       -> rt_spin_lock()\n\nThe rq lock is a raw_spinlock_t. We can't sleep while holding\nit. IOW, we can't call alloc_pages() in stack_depot_save_flags().\n\nThe task_tick_mm_cid() function with its task_work_add() call was\nintroduced by commit 223baf9d17f2 (\"sched: Fix performance regression\nintroduced by mm_cid\") in v6.4 kernel.\n\nFortunately, there is a kasan_record_aux_stack_noalloc() variant that\ncalls stack_depot_save_flags() while not allowing it to allocate\nnew pages.  To allow task_tick_mm_cid() to use task_work without\npage allocation, a new TWAF_NO_ALLOC flag is added to enable calling\nkasan_record_aux_stack_noalloc() instead of kasan_record_aux_stack()\nif set. The task_tick_mm_cid() function is modified to add this new flag.\n\nThe possible downside is the missing stack trace in a KASAN report due\nto new page allocation required when task_work_add_noallloc() is called\nwhich should be rare.",
  "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-2024-50140"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/509c29d0d26f68a6f6d0a05cb1a89725237e2b87"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce0241ef83eed55f675376e8a3605d23de53d875"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/73ab05aa46b02d96509cb029a8d04fca7bbde8c7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}