dma-debug: fix a possible deadlock on radix_lock

{
  "id": "b9ca60d8821d8f23a7bcab5af649f044a5ceac2e32f18990c637cc2d97addc12",
  "url": "https://osv.dev/vulnerability/CVE-2024-47143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dma-debug: fix a possible deadlock on radix_lock",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dma-debug: fix a possible deadlock on radix_lock radix_lock() shouldn't be held while holding dma_hash_entry[idx].lock otherwise, there's a possible deadlock scenario when dma debug API is called holding rq_lock(): CPU0 CPU1 CPU2 dma_free_attrs() check_unmap() add_dma_entry() __schedule() //out (A) rq_lock() get_hash_bucket() (A) dma_entry_hash check_sync() (A) radix_lock() (W) dma_entry_hash dma_entry_free() (W) radix_lock() // CPU2's one (W) rq_lock() CPU1 situation can happen when it extending radix tree and it tries to wake up kswapd via wake_all_kswapd(). CPU2 situation can happen while perf_event_task_sched_out() (i.e. dma sync operation is called while deleting perf_event using etm and etr tmc which are Arm Coresight hwtracing driver backends). To remove this possible situation, call dma_entry_free() after put_hash_bucket() in check_unmap().",
    "evidence": "osv:CVE-2024-47143",
    "products": [
      {
        "name": {
          "value": "Kernel",
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    "severity": "medium",
    "structured": {
      "id": "CVE-2024-47143",
      "aliases": [
        "CVE-2024-47143"
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
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      "modified": "2026-10-28T02:30:39.871510839Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3ccce34a5c3f5c9541108a451657ade621524b32",
        "https://git.kernel.org/stable/c/7543c3e3b9b88212fcd0aaf5cab5588797bdc7de",
        "https://git.kernel.org/stable/c/8c1b4fea8d62285f5e1a8194889b39661608bd8a",
        "https://git.kernel.org/stable/c/c212d91070beca0d03fef7bf988baf4ff4b3eee4",
        "https://git.kernel.org/stable/c/efe1b9bbf356357fdff0399af361133d6e3ba18e",
        "https://git.kernel.org/stable/c/f2b95248a16c5186d1c658fc0aeb2f3bd95e5259",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47143.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47143",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 507375,
  "published_at": "2025-01-11T12:25:13.561+00:00"
}