block: Fix handling of offline queues in blk_mq_alloc_request_hctx()

{
  "id": "fa141871903198d67f53ad66c05fcfcfa1894b153dd9a70155d2d8e397928270",
  "url": "https://osv.dev/vulnerability/CVE-2022-49720",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "block: Fix handling of offline queues in blk_mq_alloc_request_hctx()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: block: Fix handling of offline queues in blk_mq_alloc_request_hctx() This patch prevents that test nvme/004 triggers the following: UBSAN: array-index-out-of-bounds in block/blk-mq.h:135:9 index 512 is out of range for type 'long unsigned int [512]' Call Trace: show_stack+0x52/0x58 dump_stack_lvl+0x49/0x5e dump_stack+0x10/0x12 ubsan_epilogue+0x9/0x3b __ubsan_handle_out_of_bounds.cold+0x44/0x49 blk_mq_alloc_request_hctx+0x304/0x310 __nvme_submit_sync_cmd+0x70/0x200 [nvme_core] nvmf_connect_io_queue+0x23e/0x2a0 [nvme_fabrics] nvme_loop_connect_io_queues+0x8d/0xb0 [nvme_loop] nvme_loop_create_ctrl+0x58e/0x7d0 [nvme_loop] nvmf_create_ctrl+0x1d7/0x4d0 [nvme_fabrics] nvmf_dev_write+0xae/0x111 [nvme_fabrics] vfs_write+0x144/0x560 ksys_write+0xb7/0x140 __x64_sys_write+0x42/0x50 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae",
    "evidence": "osv:CVE-2022-49720",
    "products": [
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          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.18.6",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
    "structured": {
      "id": "CVE-2022-49720",
      "aliases": [
        "CVE-2022-49720"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:44.888480758Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/14dc7a18abbe4176f5626c13c333670da8e06aa1",
        "https://git.kernel.org/stable/c/7fa28a7c3d74933a4fc22d341b60927952f31c19",
        "https://git.kernel.org/stable/c/b202a0bd2580ee5b0453772c46d464152fafff73",
        "https://git.kernel.org/stable/c/b5e65ef044d627effdc2599040b6d204e003f955",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49720.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49720",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 512555,
  "published_at": "2025-02-26T02:24:34.194+00:00"
}