{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68090",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68090"
  ],
  "published": "2026-08-10T11:51:11Z",
  "summary": "debugobjects: Plug race against a concurrent OOM disable",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndebugobjects: Plug race against a concurrent OOM disable\n\nsyzbot reported a puzzling splat:\n\n   WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20\n\nstub_timer() is installed as timer callback function in\nhrtimer_fixup_assert_init(), which is invoked when\ndebug_object_assert_init() can't find a shadow object. In that case debug\nobjects emits a warning about it before invoking the fixup.\n\nThough the provided console log lacks this warning and instead has the\nfollowing a few seconds before the splat:\n\n     ODEBUG: Out of memory. ODEBUG disabled\n\nSo the object was looked up in debug_object_assert_init() and the lookup\nfailed due a concurrent out of memory situation which disabled debug\nobjects and freed the shadow objects:\n\ndebug_object_assert_init()\n        if (!debug_objects_enabled)\n        \treturn;                         obj = alloc();\n                \t\t\t\tif (!obj) {\n\t\t\t\t\t\t\t// Out of memory\n                                                \tdebug_objects_enabled = false;\n                                                        free_objects();\n        obj = lookup_or_alloc();\n\n        // The lookup failed because the other side\n        // removed the objects, so this returns\n        // an error code as the object in question\n        // is not statically initialized\n\n\tif (!IS_ERR_OR_NULL(obj))\n        \treturn;\n        if (!obj) {\n        \tdebug_oom();\n                return;\n        }\n\n        print(...)\n           if (!debug_objects_enabled)\n                return;\n\n        fixup(...)\n\nThe debug object splat is skipped because debug_objects_enabled is false,\nbut the fixup callback is invoked unconditionally, which makes the timer\ndisfunctional.\n\nThis is only a problem in debug_object_assert_init() and\ndebug_object_activate() as both have to handle statically initialized\nobjects and therefore must handle the error pointer return case\ngracefully. All other places only handle the found/not found case and the\nNULL pointer return is a signal for OOM. Otherwise they get a valid shadow\nobject.\n\nPlug the hole by checking whether debug objects are still enabled before\ninvoking the print and fixup function in those two places.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68090"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2d5e320b7ab9b25229ac4331541964a58b5e1d29"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/203a965bf2ab43130778d8214fb0c3c8c2d19cdf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/23da32e88627e63e0864f59f4c63a2dc0ab851a3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d663fbf28b2eebe665bb9cf828d7d528e5a8707e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e2e255d07723c330dded8e576ce28a8d23a692ce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c00164c9e7fa6145886ad666806cb5347895de5c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1f4f02b336c3be125c8fcf87df73db2e0e028b8b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b81dde13cc163450dcb402dcc915ef13ba241e01"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}