io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop

{
  "id": "ce5a9e276d2b15f9f0fce34869f3f4d8adeea8e65ca83daac50e3161bf5a95b6",
  "url": "https://osv.dev/vulnerability/CVE-2026-23113",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop Currently this is checked before running the pending work. Normally this is quite fine, as work items either end up blocking (which will create a new worker for other items), or they complete fairly quickly. But syzbot reports an issue where io-wq takes seemingly forever to exit, and with a bit of debugging, this turns out to be because it queues a bunch of big (2GB - 4096b) reads with a /dev/msr* file. Since this file type doesn't support ->read_iter(), loop_rw_iter() ends up handling them. Each read returns 16MB of data read, which takes 20 (!!) seconds. With a bunch of these pending, processing the whole chain can take a long time. Easily longer than the syzbot uninterruptible sleep timeout of 140 seconds. This then triggers a complaint off the io-wq exit path: INFO: task syz.4.135:6326 blocked for more than 143 seconds. Not tainted syzkaller #0 Blocked by coredump. \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message. task:syz.4.135 state:D stack:26824 pid:6326 tgid:6324 ppid:5957 task_flags:0x400548 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1139/0x6150 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6960 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [i",
    "evidence": "osv:CVE-2026-23113",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.203",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.167",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.122",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.68",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23113",
      "aliases": [
        "CVE-2026-23113"
      ],
      "affected": [
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                  "fixed": "27e47500fac23d15b7dc93ff650bc4844d2581bd"
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                {
                  "fixed": "d05d99573f81a091547b1778b9a50120f5d6c68a"
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                {
                  "fixed": "85eb83694a91c89d9abe615d717c0053c3efa714"
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                  "fixed": "2e8ca1078b14142db2ce51cbd18ff9971560046b"
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                  "fixed": "10dc959398175736e495f71c771f8641e1ca1907"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23113.json"
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              "type": "ECOSYSTEM",
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                  "introduced": "5.12.0"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:28.172592056Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/10dc959398175736e495f71c771f8641e1ca1907",
        "https://git.kernel.org/stable/c/27e47500fac23d15b7dc93ff650bc4844d2581bd",
        "https://git.kernel.org/stable/c/2e8ca1078b14142db2ce51cbd18ff9971560046b",
        "https://git.kernel.org/stable/c/85eb83694a91c89d9abe615d717c0053c3efa714",
        "https://git.kernel.org/stable/c/bdf0bf73006ea8af9327cdb85cfdff4c23a5f966",
        "https://git.kernel.org/stable/c/d05d99573f81a091547b1778b9a50120f5d6c68a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23113.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23113",
        "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/2026/23xxx/CVE-2026-23113.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23113",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494584,
  "published_at": "2026-02-14T15:09:46.379+00:00"
}