debugobjects: Plug race against a concurrent OOM disable

{
  "id": "ecad2864757cd04428b1517fe1e7cc0a5e8e6aba8eac42f531784dbeba088224",
  "url": "https://osv.dev/vulnerability/CVE-2026-68090",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "debugobjects: Plug race against a concurrent OOM disable",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: debugobjects: Plug race against a concurrent OOM disable syzbot reported a puzzling splat: WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20 stub_timer() is installed as timer callback function in hrtimer_fixup_assert_init(), which is invoked when debug_object_assert_init() can't find a shadow object. In that case debug objects emits a warning about it before invoking the fixup. Though the provided console log lacks this warning and instead has the following a few seconds before the splat: ODEBUG: Out of memory. ODEBUG disabled So the object was looked up in debug_object_assert_init() and the lookup failed due a concurrent out of memory situation which disabled debug objects and freed the shadow objects: debug_object_assert_init() if (!debug_objects_enabled) return; obj = alloc(); if (!obj) { // Out of memory debug_objects_enabled = false; free_objects(); obj = lookup_or_alloc(); // The lookup failed because the other side // removed the objects, so this returns // an error code as the object in question // is not statically initialized if (!IS_ERR_OR_NULL(obj)) return; if (!obj) { debug_oom(); return; } print(...) if (!debug_objects_enabled) return; fixup(...) The debug object splat is skipped because debug_objects_enabled is false, but the fixup callback is invoked unconditionally, which makes the timer disfunctional. This is only a problem in debug_object_assert_init() and debug_object_activate() a",
    "evidence": "osv:CVE-2026-68090",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.261",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.212",
            "evidence": "/affected/1/ranges"
          },
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            "value": "6.1.178",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68090",
      "aliases": [
        "CVE-2026-68090"
      ],
      "affected": [
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                  "fixed": "203a965bf2ab43130778d8214fb0c3c8c2d19cdf"
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                  "fixed": "23da32e88627e63e0864f59f4c63a2dc0ab851a3"
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                  "fixed": "d663fbf28b2eebe665bb9cf828d7d528e5a8707e"
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              "type": "ECOSYSTEM",
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                  "introduced": "3.3.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:45.125071660Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1f4f02b336c3be125c8fcf87df73db2e0e028b8b",
        "https://git.kernel.org/stable/c/203a965bf2ab43130778d8214fb0c3c8c2d19cdf",
        "https://git.kernel.org/stable/c/23da32e88627e63e0864f59f4c63a2dc0ab851a3",
        "https://git.kernel.org/stable/c/2d5e320b7ab9b25229ac4331541964a58b5e1d29",
        "https://git.kernel.org/stable/c/b81dde13cc163450dcb402dcc915ef13ba241e01",
        "https://git.kernel.org/stable/c/c00164c9e7fa6145886ad666806cb5347895de5c",
        "https://git.kernel.org/stable/c/d663fbf28b2eebe665bb9cf828d7d528e5a8707e",
        "https://git.kernel.org/stable/c/e2e255d07723c330dded8e576ce28a8d23a692ce",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68090.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68090",
        "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/2026/68xxx/CVE-2026-68090.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68090",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 513340,
  "published_at": "2026-08-10T11:51:45.149+00:00"
}