{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56613",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-56613"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "sched/numa: fix memory leak due to the overwritten vma->numab_state",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/numa: fix memory leak due to the overwritten vma->numab_state\n\n[Problem Description]\nWhen running the hackbench program of LTP, the following memory leak is\nreported by kmemleak.\n\n  # /opt/ltp/testcases/bin/hackbench 20 thread 1000\n  Running with 20*40 (== 800) tasks.\n\n  # dmesg | grep kmemleak\n  ...\n  kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n  kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n\n  # cat /sys/kernel/debug/kmemleak\n  unreferenced object 0xffff888cd8ca2c40 (size 64):\n    comm \"hackbench\", pid 17142, jiffies 4299780315\n    hex dump (first 32 bytes):\n      ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00  .tI.....L.I.....\n      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    backtrace (crc bff18fd4):\n      [<ffffffff81419a89>] __kmalloc_cache_noprof+0x2f9/0x3f0\n      [<ffffffff8113f715>] task_numa_work+0x725/0xa00\n      [<ffffffff8110f878>] task_work_run+0x58/0x90\n      [<ffffffff81ddd9f8>] syscall_exit_to_user_mode+0x1c8/0x1e0\n      [<ffffffff81dd78d5>] do_syscall_64+0x85/0x150\n      [<ffffffff81e0012b>] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  ...\n\nThis issue can be consistently reproduced on three different servers:\n  * a 448-core server\n  * a 256-core server\n  * a 192-core server\n\n[Root Cause]\nSince multiple threads are created by the hackbench program (along with\nthe command argument 'thread'), a shared vma might be accessed by two or\nmore cores simultaneously. When two or more cores observe that\nvma->numab_state is NULL at the same time, vma->numab_state will be\noverwritten.\n\nAlthough current code ensures that only one thread scans the VMAs in a\nsingle 'numa_scan_period', there might be a chance for another thread\nto enter in the next 'numa_scan_period' while we have not gotten till\nnumab_state allocation [1].\n\nNote that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000`\ncannot the reproduce the issue. It is verified with 200+ test runs.\n\n[Solution]\nUse the cmpxchg atomic operation to ensure that only one thread executes\nthe vma->numab_state assignment.\n\n[1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.6.51-1+rpt1",
        "1:6.6.51-1+rpt2",
        "1:6.6.51-1+rpt3",
        "1:6.6.62-1+rpt1"
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56613"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f149bcc4d91ac92b32ff4949b291e6ed883dc42"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a71ddd5b87cda687efa28e049e85e923689bcef9"
    },
    {
      "type": "FIX",
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    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}