io_uring/tctx: work around xa_store() allocation error issue

{
  "id": "07a46f524b56518576d7899d377c63e006d26c41d1af3151168c748e3a8c3da4",
  "url": "https://osv.dev/vulnerability/CVE-2024-56584",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "io_uring/tctx: work around xa_store() allocation error issue",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: io_uring/tctx: work around xa_store() allocation error issue syzbot triggered the following WARN_ON: WARNING: CPU: 0 PID: 16 at io_uring/tctx.c:51 __io_uring_free+0xfa/0x140 io_uring/tctx.c:51 which is the WARN_ON_ONCE(!xa_empty(&tctx->xa)); sanity check in __io_uring_free() when a io_uring_task is going through its final put. The syzbot test case includes injecting memory allocation failures, and it very much looks like xa_store() can fail one of its memory allocations and end up with ->head being non-NULL even though no entries exist in the xarray. Until this issue gets sorted out, work around it by attempting to iterate entries in our xarray, and WARN_ON_ONCE() if one is found.",
    "evidence": "osv:CVE-2024-56584",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.253",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.203",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.66",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.5",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-56584",
      "aliases": [
        "CVE-2024-56584"
      ],
      "affected": [
        {
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              "type": "GIT",
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                {
                  "fixed": "42882b583095dcf747da6e3af1daeff40e27033e"
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                {
                  "fixed": "d5b2ddf1f90c7248eff9630b95895c8950f2f36d"
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                {
                  "fixed": "7eb75ce7527129d7f1fee6951566af409a37a1c4"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56584.json"
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              "type": "ECOSYSTEM",
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56584.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.364027271Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3a84fa784710990964c1e35df743851ab2863898",
        "https://git.kernel.org/stable/c/42882b583095dcf747da6e3af1daeff40e27033e",
        "https://git.kernel.org/stable/c/7eb75ce7527129d7f1fee6951566af409a37a1c4",
        "https://git.kernel.org/stable/c/94ad56f61b873ffeebcc620d451eacfbdf9d40f0",
        "https://git.kernel.org/stable/c/d5b2ddf1f90c7248eff9630b95895c8950f2f36d",
        "https://git.kernel.org/stable/c/e05c070b401f6365c503e2b59f091331965c4fb9",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56584.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56584",
        "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/2024/56xxx/CVE-2024-56584.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-56584",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518661,
  "published_at": "2024-12-27T14:50:52.735+00:00"
}