scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler

{
  "id": "f8cffd7c8523864ca403327e1617ceab977971180129abfd6d350f22e205c9b0",
  "url": "https://osv.dev/vulnerability/CVE-2024-26627",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler Inside scsi_eh_wakeup(), scsi_host_busy() is called & checked with host lock every time for deciding if error handler kthread needs to be waken up. This can be too heavy in case of recovery, such as: - N hardware queues - queue depth is M for each hardware queue - each scsi_host_busy() iterates over (N * M) tag/requests If recovery is triggered in case that all requests are in-flight, each scsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called for the last in-flight request, scsi_host_busy() has been run for (N * M - 1) times, and request has been iterated for (N*M - 1) * (N * M) times. If both N and M are big enough, hard lockup can be triggered on acquiring host lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169). Fix the issue by calling scsi_host_busy() outside the host lock. We don't need the host lock for getting busy count because host the lock never covers that. [mkp: Drop unnecessary 'busy' variables pointed out by Bart]",
    "evidence": "osv:CVE-2024-26627",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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    "severity": "medium",
    "structured": {
      "id": "CVE-2024-26627",
      "aliases": [
        "CVE-2024-26627"
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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": "2026-10-28T02:30:51.608333010Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb",
        "https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0",
        "https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1",
        "https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059",
        "https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c",
        "https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26627.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26627",
        "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": 520134,
  "published_at": "2024-03-06T06:45:34.339+00:00"
}