blk-iocost: do not WARN if iocg was already offlined

{
  "id": "f873840716d33ab70e46529e499b050228699971dadc4f3da993f0238760d276",
  "url": "https://osv.dev/vulnerability/CVE-2024-36908",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "blk-iocost: do not WARN if iocg was already offlined",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: blk-iocost: do not WARN if iocg was already offlined In iocg_pay_debt(), warn is triggered if 'active_list' is empty, which is intended to confirm iocg is active when it has debt. However, warn can be triggered during a blkcg or disk removal, if iocg_waitq_timer_fn() is run at that time: WARNING: CPU: 0 PID: 2344971 at block/blk-iocost.c:1402 iocg_pay_debt+0x14c/0x190 Call trace: iocg_pay_debt+0x14c/0x190 iocg_kick_waitq+0x438/0x4c0 iocg_waitq_timer_fn+0xd8/0x130 __run_hrtimer+0x144/0x45c __hrtimer_run_queues+0x16c/0x244 hrtimer_interrupt+0x2cc/0x7b0 The warn in this situation is meaningless. Since this iocg is being removed, the state of the 'active_list' is irrelevant, and 'waitq_timer' is canceled after removing 'active_list' in ioc_pd_free(), which ensures iocg is freed after iocg_waitq_timer_fn() returns. Therefore, add the check if iocg was already offlined to avoid warn when removing a blkcg or disk.",
    "evidence": "osv:CVE-2024-36908",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.237",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.181",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.135",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.31",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.8.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-36908",
      "aliases": [
        "CVE-2024-36908"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "56a9d07f427378eeb75b917bb49c6fbea8204126"
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                {
                  "fixed": "7d215e013d097ed6fc4b0ad0272c9514214dc408"
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                {
                  "fixed": "aed0aac18f039dd4af13c143063754efca358cb0"
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                {
                  "fixed": "1c172ac7afe4442964f4153b2c78fe4e005d9d67"
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                {
                  "fixed": "14b3275f93d4a0d8ddc02195bc4e9869b7a3700e"
                },
                {
                  "fixed": "01bc4fda9ea0a6b52f12326486f07a4910666cf6"
                }
              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-36908.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.4.0"
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                  "fixed": "5.10.237"
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              "type": "ECOSYSTEM",
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
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                {
                  "fixed": "6.1.135"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.2.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-36908.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.018181178Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/01bc4fda9ea0a6b52f12326486f07a4910666cf6",
        "https://git.kernel.org/stable/c/14b3275f93d4a0d8ddc02195bc4e9869b7a3700e",
        "https://git.kernel.org/stable/c/1c172ac7afe4442964f4153b2c78fe4e005d9d67",
        "https://git.kernel.org/stable/c/56a9d07f427378eeb75b917bb49c6fbea8204126",
        "https://git.kernel.org/stable/c/7d215e013d097ed6fc4b0ad0272c9514214dc408",
        "https://git.kernel.org/stable/c/aed0aac18f039dd4af13c143063754efca358cb0",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/36xxx/CVE-2024-36908.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-36908",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/36xxx/CVE-2024-36908.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-36908",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 512562,
  "published_at": "2024-05-30T15:29:07.773+00:00"
}