CVE-2026-99230 (GCVE-0-2026-99230)

Vulnerability from cvelistv5 – Published: 2026-11-02 16:06 – Updated: 2026-11-03 19:13
VLAI
Title
io_uring/cmd: don't leave list poison in ->hash_node
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/cmd: don't leave list poison in ->hash_node io_uring_cmd_del_cancelable() uses hlist_del() to take a command off ->cancelable_uring_cmd, which leaves LIST_POISON1/2 behind in ->hash_node. Requests are recycled through the request cache without being reinitialised, and not every user of ->hash_node sets it up before it is used: If a vectored futex wait is woken while futex_wait_multiple_setup() is still queueing the futexes, io_futexv_wait() doesn't add the request to ->futex_list, and leaves the completion to the task_work queued by the wake up. io_futexv_complete() ends in __io_futex_complete(), whose hlist_del_init() is fine for a request that is unhashed, which is how all other users of the node leave it. If the request was a cancelable uring_cmd in its previous life, e.g. a ublk FETCH_REQ, it writes through LIST_POISON2: Oops: general protection fault, probably for non-canonical address KASAN: maybe wild-memory-access in range [0xdead000000000120-...] RIP: 0010:io_futexv_complete+0x219/0x420 Call Trace: tctx_task_work_run+0x804/0x950 tctx_task_work+0x71/0xa0 task_work_run+0x118/0x200 Leave the node unhashed.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 93b8cc60c37b9d17732b7a297e5dca29b50a990d , < cc7f13d006fcefed9564bd79f135b51d344e9c77 (git)
Affected: 93b8cc60c37b9d17732b7a297e5dca29b50a990d , < 2d5af21422060c088f6e4fb0f1e7dcf5bcdd6707 (git)
Affected: 93b8cc60c37b9d17732b7a297e5dca29b50a990d , < 685b49483200384d7f49d338af476e26e6824637 (git)
Affected: 93b8cc60c37b9d17732b7a297e5dca29b50a990d , < 4c83e39f4d1944d7146fd06094f2c8053238d55c (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.60 , ≤ 6.18.* (semver)
Unaffected: 7.2.14 , ≤ 7.2.* (semver)
Unaffected: 7.4-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/uring_cmd.c"
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          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
          "versions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/cmd: don\u0027t leave list poison in -\u003ehash_node\n\nio_uring_cmd_del_cancelable() uses hlist_del() to take a command off\n-\u003ecancelable_uring_cmd, which leaves LIST_POISON1/2 behind in\n-\u003ehash_node. Requests are recycled through the request cache without\nbeing reinitialised, and not every user of -\u003ehash_node sets it up before\nit is used:\n\nIf a vectored futex wait is woken while futex_wait_multiple_setup() is\nstill queueing the futexes, io_futexv_wait() doesn\u0027t add the request to\n-\u003efutex_list, and leaves the completion to the task_work queued by the\nwake up. io_futexv_complete() ends in __io_futex_complete(), whose\nhlist_del_init() is fine for a request that is unhashed, which is how all\nother users of the node leave it. If the request was a cancelable\nuring_cmd in its previous life, e.g. a ublk FETCH_REQ, it writes through\nLIST_POISON2:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: maybe wild-memory-access in range [0xdead000000000120-...]\n  RIP: 0010:io_futexv_complete+0x219/0x420\n  Call Trace:\n   tctx_task_work_run+0x804/0x950\n   tctx_task_work+0x71/0xa0\n   task_work_run+0x118/0x200\n\nLeave the node unhashed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-03T19:13:01.012Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/cc7f13d006fcefed9564bd79f135b51d344e9c77"
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          "url": "https://git.kernel.org/stable/c/2d5af21422060c088f6e4fb0f1e7dcf5bcdd6707"
        },
        {
          "url": "https://git.kernel.org/stable/c/685b49483200384d7f49d338af476e26e6824637"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c83e39f4d1944d7146fd06094f2c8053238d55c"
        }
      ],
      "title": "io_uring/cmd: don\u0027t leave list poison in -\u003ehash_node",
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        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99230",
    "datePublished": "2026-11-02T16:06:37.984Z",
    "dateReserved": "2026-09-25T10:25:14.402Z",
    "dateUpdated": "2026-11-03T19:13:01.012Z",
    "state": "PUBLISHED"
  },
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/cmd: don\u0027t leave list poison in -\u003ehash_node\n\nio_uring_cmd_del_cancelable() uses hlist_del() to take a command off\n-\u003ecancelable_uring_cmd, which leaves LIST_POISON1/2 behind in\n-\u003ehash_node. Requests are recycled through the request cache without\nbeing reinitialised, and not every user of -\u003ehash_node sets it up before\nit is used:\n\nIf a vectored futex wait is woken while futex_wait_multiple_setup() is\nstill queueing the futexes, io_futexv_wait() doesn\u0027t add the request to\n-\u003efutex_list, and leaves the completion to the task_work queued by the\nwake up. io_futexv_complete() ends in __io_futex_complete(), whose\nhlist_del_init() is fine for a request that is unhashed, which is how all\nother users of the node leave it. If the request was a cancelable\nuring_cmd in its previous life, e.g. a ublk FETCH_REQ, it writes through\nLIST_POISON2:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: maybe wild-memory-access in range [0xdead000000000120-...]\n  RIP: 0010:io_futexv_complete+0x219/0x420\n  Call Trace:\n   tctx_task_work_run+0x804/0x950\n   tctx_task_work+0x71/0xa0\n   task_work_run+0x118/0x200\n\nLeave the node unhashed."
          }
        ],
        "id": "CVE-2026-99230",
        "lastModified": "2026-11-03T20:18:28.873",
        "metrics": {},
        "published": "2026-11-02T16:17:47.927",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-04T12:48:19+00:00",
      "cve": "CVE-2026-99230",
      "id": "CVE-2026-99230",
      "initial_release_date": "2026-11-02T16:06:37.984000+00:00",
      "product_status:known_affected": "187",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via uninitialized list node in io_uring",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99230.json",
      "version": "3"
    }
  }
}



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